Minecraft Forums

If you're using 1.16, you can use the new custom world creator and do what you want using the instructions provided here: https://minecraft.gamepedia.com/Custom. I'm not sure if world presets are still supported. A generator for it is available at https://misode.github.io/world/.

Quote from pierconick»

Strongholds aren't particularly challenging, there isn't any particular reason to explore an Ocean Monument, you get better loot in a Desert Pyramid than a Woodland Mansion

However, these sort of things seem to be a let down. Both the woodland mansion and the mushroom isle are incredibly difficult to find... and neither one is particularily useful. The Woodland Mansion has some decent loot, but it's ridiculously challenging, and odds are you're going to use up more resources getting through it than you'll actually obtain. As for the Mushroom Isle... well, it isn't as if there's much there worth making the journey. The Mooshrooms are cute, I suppose, but they're not even a sustainable source of Mushrooms.

I have nothing against your suggestion in general, but I do believe that the quoted claims are inaccurate. Woodland mansions are known for being HUGE and full of all sorts of loot. It is one of the only sources of the Totem of Undying, which is priceless in Hardcore mode and can save you from losing a lot of items in other modes. Other loot can include TNT, diamond blocks, enchanted golden apples, ender pearls, obsidian, and books - both enchanted and regular (through library rooms). If you compare The loot of the mansion to The loot of the pyramid, you can see that the mansion essentially offers the same items as the temple plus some extras like diamond chestplates and music discs. The rooms can contain materials like string (from cobwebs and spiders) and saplings, plus you can even get a decent amount of TNT, just like in the temple.

Ocean monuments are almost entirely made out of unique items, both aesthetic (prismarine) and utility (sponges). You can also get gold and complete advancements by going here. There is plenty of reason to venture into an ocean monument.

Mushroom islands have GIANT mushrooms, which can be broken like trees to get many individual mushroom items. Plus, the mycelium allows you to grow the mushrooms back, making a farm. Not like you'll really need it because Mooshrooms can be milked using a bowl to generate unlimited mushroom stew, as well as acting exactly like a regular cow. Brown mooshrooms can generate suspicious stew, giving you interesting effects, and essentially acting as a potion. When you're done farming, you can shear for a guaranteed 5 mushrooms, which can create multiple stews. Read this for yourself.

You completely underestimate the value of these structures.

Quote from piglin_brute»

Gold armor is good if you are doing a nether survival durabilyty of the gold armor is good but the gold tools break realy quick but they have a realy high chanse of getting good enchantments if you are doing a nether survival you need gold armor and olso if you trade with piglins they always give you enchanted gold items but ım just a piglin brute ı love gold dont listen to me and my piglin brothers

This thread was created years before the addition of the Nether Update, thus it doesn't consider benefits provided by piglins and the like.

?If one of your computers has backups enabled, it's possible that one of the backups could contain the correct data in the server list file.

Axolotls just got added. I find it interesting how they can remove mining fatigue and play dead.

Would you not have to remove the tag when players rejoin the game or does that automatically happen when you leave? As far as I can tell, these commands will run the first time an entity is seen to exist in the world, but if they leave and rejoin it won't run because they already obtained the tag from the previous time the message was sent.

Quote from schmillen2»

Take a look at some of the latest features they've introduced - Things from 1.17: Goats drop nothing meaningful, the spygalss is utterly useless, the Warden will drop nothing and there will be absolutely no point in killing it. And if we go back a few updates - pandas do nothing, polar bears do nothing, the only useful somewhat thing about turtles are their eggs. It took Mojang months to figure out how to make it possible to place chains horizontally and make them waterloggable. And still - chains are simply a cosmetic block - why didn't they make it possible to pull stuff with them? (video 1)

The spyglass isn't useless, it allows you to increase your vision, and it works multiple times better than optifine does. Some of these mobs don't drop because they are hostile and intended to add a challenge to the game, not to be exploited. The warden won't drop anything because it's not supposed to be killed but instead avoided at all costs. It makes the game harder rather than more convenient. Turtles can be used to create turtle shell helmets, and the others were added for environmental reasons, which is a poor excuse to add something into the game, but still a legitimate reason. They don't hurt anything by existing, so the only complaints I have are about lost potential. It likely did not take them months to figure out the chain thing - Development in a company like that is slower than individually, and they had to decide that they were going to add these features first (it is not a given that this should be done).

Quote from dankest_memer»

I'm going to be honest, and this probably will never see the light of day, but I'm going to write this anyway. I feel that in the past year or two, Minecraft has definitely taken a turn for the worse. I feel that the only update that has recently actually improved the game in the way that it should be improved, is 1.14. I'm going to talk about every update after 1.8, and say why they added value and challenge to the game, and then why I think 1.15, 1.16, and then when it releases, 1.17, are not, in my opinion, good for the game, and definitely not adding value.

So, what you're saying is that the three latest updates are completely pointless and don't do anything good for the game? If they even add one good thing, they must be adding value.

So, what the 1.15, 1.16, and 1.17 versions of the game added, and why I really do not like them.

1.15: This added Bees and Honey. This itself was decent, and not an issue. What I really feel, however, is wrong with this update, is the Honey Block. Before this, there only used to be slime blocks, so you could move large, massive things, it would just be complicated and a pain to do so. Now, with the addition of the Honey block, which are essentially the same as Slime blocks, accept that they don't stick to them like Slime blocks would if you put them side by side. This made it so that you could build a massive door with a bunch of side-by-side flying machines, alternating Slime Blocks and Honey Blocks, instead of having to make one that was quite complicated due to the properties of Slime blocks. In my opinion, this makes it way too easy to build up what used to be incredibly complicated and elaborate Redstone machines. TL;DR for this update, this makes things that were and should be complicated, much easier than they should be.

You said yourself that building giant redstone machines was a pain, so why would you intentionally advocate for that pain to remain where it is? What about a pointless challenge like this is so appealing? 1.15 was also mostly a bug fixing update, so the game was improved because it performed better.

Now, for 1.16: This added many things, including Basalt, Blackstone, Chains, more variations of Nether Bricks, Crimson and Warped fungi, nylium, and wood, gilded blackstone, crying obsidian, lodestone, respawn anchor, shroomlight, a blue variation of all fires, a target block, the mobs Hoglins, Piglins, Striders, and Zoglins. It also added the Bastion Remnant, a building with lots of Piglins, with gold blocks and other loot inside. It added 4 new biomes as well. Basalt Deltas, Crimson Forests, Warped Forests, and Soul Sand valleys. Here is what I find so incredibly wrong about this, starting with this and moving to 1.17. To start off, I feel some of the new mobs and textures look a bit un-Minecrafty, but that's not the main issue. A lot of features, the biomes in particular, as well as the ability to trade with Piglins, feel almost modded to me.

You know what else felt "modded"? Pretty much every single thing that was added to the game since the modding community started up. This argument is just an irrational fear of change, and it stands in the way of evolution. They've already overhauled almost all the textures, making the game look and feel much different than before. Why can't the game change any more?

But that's not even the worst part for me. There are two larger issues. The first is converting Zombie Pigmen into Zombified Piglins. This just changes so much of one of the dimensions, one of the key functions of the game, into simply a weird looking version of a new mob. This disrupts the mystery of the nether, the intrigue.

The zombie pigman has ONLY changed aesthetically, and it pretty much looked like a weird piglin in the first place. If the model hadn't changed, it would have just looked like a slightly weirder piglin, but it still would have looked like one. Otherwise, nothing changed.

And now, for my least favorite part of this update, the Netherite. This is, by far, the worst change, in my opinion, they have ever made. This takes out a large part of the challenge of the game. To start, you don't take as much knockback, making it so that it's easier to win, and not to be knocked off of ledges, in PvP. Then, there's the fact that it makes it basically impossible to die when you are fighting any mob in the game, because of how incredibly well it protects you.

Netherite has the exact same protection level as diamond armor, and the knockback resistance doesn't work every time. It's not much better than diamond itself.

The tools make doing anything basically like mining it in creative mode as well.

Efficiency is also only barely changed, and instamining is still just as possible as it was before.

Now. For by far the worst update they will ever add to the game, 1.17. There are three features of this update, as it is at the time of writing this, that I actually feel improve the gameplay experience. I am also talking from the perspective of the current snapshot, 20w49a, as well as the reveal trailer. The three things I do like: 1. Taller, more generated mountains. 2. The ability to path any subtype of dirt block and 3. The ability to waterlog minecarts/minecart rails. Other than that, the textures, the features, all of that, just looks and performs like they went to about 10 mod pages, picked a random feature, and threw it into the game.

What is with this fear of evolution? Why is change so bad for Minecraft?

Stalagmites/Stalagtites, where and why? Also, they are the least Minecraft-like texture. The game is looking less and less like itself with every update, and I feel this bodes poorly for the future. The fossils are just odd, and again, oddly textured for a game like this.

It's literally the exact same as a regular block, just with a snow animation. The game is all about exploring and reaping resources from the blocks, so archaeology fits perfectly into the theme.

The Warden is a cool concept but looks like it never should've been considered a serious texture, and last but not least. Skulk sensors. Wireless Redstone. That's it.

The Warden is part of a brand new part of the lore that was never seen at all before the announcement. How are you already going to claim that it doesn't fit when you haven't even seen what it would fit into?

Quote from Greatwhitedragon»

When i try adding structures to the above syntex i dont understand what "salt" is or what integer salt should be for a particular structure. So i put a random number in and then i get errors. Im having trouble getiing strongholds to spawn like they do in vanilla mc i dont know what the default settings for stronghold or mineshaft is.

Or how many chunks seperate or spacing between them ahould be.

Can someone shed some light on this please?

I found a version with all the structures included. Note that this value sets all seeds to "0", which you would probably like to change when creating new worlds. I'm pasting it here:

{
  "bonus_chest": false,
  "dimensions": {
    "minecraft:overworld": {
      "type": {
	    "logical_height": 256,
	    "infiniburn": "minecraft:infiniburn_overworld",
	    "effects": "minecraft:overworld",
	    "ambient_light": 0.0,
	    "bed_works": true,
	    "respawn_anchor_works": false,
		"has_raids": true,
	    "ultrawarm": false,
	    "natural": true,
	    "coordinate_scale": 1.0,
	    "piglin_safe": false,
	    "has_skylight": true,
	    "has_ceiling": false
      },
      "generator": {
        "biome_source": {
          "seed": 0,
          "large_biomes": false,
          "type": "minecraft:vanilla_layered"
        },
        "seed": 0,
        "settings": {
		  "bedrock_roof_position": -10,
		  "bedrock_floor_position": 0,
		  "sea_level": 63,
		  "disable_mob_generation": false,
		  "structures": {
			"stronghold": {
			  "distance": 32,
			  "spread": 3,
			  "count": 128
			},
			"structures": {
			  "minecraft:buried_treasure": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:ruined_portal": {
				"spacing": 40,
				"separation": 15,
				"salt": 34222645
			  },
			  "minecraft:mansion": {
				"spacing": 80,
				"separation": 20,
				"salt": 10387319
			  },
			  "minecraft:nether_fossil": {
				"spacing": 2,
				"separation": 1,
				"salt": 14357921
			  },
			  "minecraft:endcity": {
				"spacing": 20,
				"separation": 11,
				"salt": 10387313
			  },
			  "minecraft:igloo": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357618
			  },
			  "minecraft:fortress": {
				"spacing": 27,
				"separation": 4,
				"salt": 30084232
			  },
			  "minecraft:bastion_remnant": {
				"spacing": 27,
				"separation": 4,
				"salt": 30084232
			  },
			  "minecraft:swamp_hut": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357620
			  },
			  "minecraft:monument": {
				"spacing": 32,
				"separation": 5,
				"salt": 10387313
			  },
			  "minecraft:pillager_outpost": {
				"spacing": 32,
				"separation": 8,
				"salt": 165745296
			  },
			  "minecraft:ocean_ruin": {
				"spacing": 20,
				"separation": 8,
				"salt": 14357621
			  },
			  "minecraft:mineshaft": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:village": {
				"spacing": 32,
				"separation": 8,
				"salt": 10387312
			  },
			  "minecraft:shipwreck": {
				"spacing": 24,
				"separation": 4,
				"salt": 165745295
			  },
			  "minecraft:desert_pyramid": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357617
			  },
			  "minecraft:stronghold": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:jungle_pyramid": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357619
			  }
			}
		  },
		  "noise": {
			"random_density_offset": true,
			"density_factor": 1.0,
			"density_offset": -0.46875,
			"simplex_surface_noise": true,
			"bottom_slide": {
			  "target": -30,
			  "size": 0,
			  "offset": 0
			},
			"size_horizontal": 1,
			"size_vertical": 2,
			"height": 256,
			"sampling": {
			  "xz_scale": 0.9999999814507745,
			  "y_scale": 0.9999999814507745,
			  "xz_factor": 80.0,
			  "y_factor": 160.0
			},
			"top_slide": {
			  "target": -10,
			  "size": 3,
			  "offset": 0
			}
		  },
		  "default_block": {
			"Name": "minecraft:stone"
		  },
		  "default_fluid": {
			"Properties": {
			  "level": "0"
			},
			"Name": "minecraft:water"
		  }
		},
        "type": "minecraft:noise"
      }
    },
    "minecraft:the_nether": {
      "type": {
	    "logical_height": 128,
	    "infiniburn": "minecraft:infiniburn_nether",
	    "effects": "minecraft:the_nether",
	    "ambient_light": 0.1,
	    "bed_works": false,
	    "respawn_anchor_works": true,
	    "has_raids": false,
	    "ultrawarm": true,
	    "natural": false,
	    "coordinate_scale": 8.0,
	    "piglin_safe": true,
	    "fixed_time": 18000,
	    "has_skylight": false,
	    "has_ceiling": true
	  },
	  "generator": {
		"biome_source": {
		  "humidity_noise": {
			"firstOctave": -7,
			"amplitudes": [
			  1.0,
			  1.0
			]
		  },
		  "altitude_noise": {
			"firstOctave": -7,
			"amplitudes": [
			  1.0,
			  1.0
			]
		  },
		  "weirdness_noise": {
			"firstOctave": -7,
			"amplitudes": [
			  1.0,
			  1.0
			]
		  },
		  "seed": 0,
		  "biomes": [
			{
			  "parameters": {
				"altitude": 0.0,
				"weirdness": 0.0,
				"offset": 0.0,
				"temperature": 0.0,
				"humidity": 0.0
			  },
			  "biome": "minecraft:nether_wastes"
			},
			{
			  "parameters": {
				"altitude": 0.0,
				"weirdness": 0.0,
				"offset": 0.0,
				"temperature": 0.0,
				"humidity": -0.5
			  },
			  "biome": "minecraft:soul_sand_valley"
			},
			{
			  "parameters": {
				"altitude": 0.0,
				"weirdness": 0.0,
				"offset": 0.0,
				"temperature": 0.4,
				"humidity": 0.0
			  },
			  "biome": "minecraft:crimson_forest"
			},
			{
			  "parameters": {
				"altitude": 0.0,
				"weirdness": 0.0,
				"offset": 0.375,
				"temperature": 0.0,
				"humidity": 0.5
			  },
			  "biome": "minecraft:warped_forest"
			},
			{
			  "parameters": {
				"altitude": 0.0,
				"weirdness": 0.0,
				"offset": 0.175,
				"temperature": -0.5,
				"humidity": 0.0
			  },
			  "biome": "minecraft:basalt_deltas"
			}
		  ],
		  "temperature_noise": {
			"firstOctave": -7,
			"amplitudes": [
			  1.0,
			  1.0
			]
		  },
		  "type": "minecraft:multi_noise"
		},
        "seed": 0,
        "settings": {
		  "bedrock_roof_position": 0,
		  "bedrock_floor_position": 0,
		  "sea_level": 32,
		  "disable_mob_generation": false,
		  "structures": {
			"structures": {
			  "minecraft:buried_treasure": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:ruined_portal": {
				"spacing": 25,
				"separation": 10,
				"salt": 34222645
			  },
			  "minecraft:mansion": {
				"spacing": 80,
				"separation": 20,
				"salt": 10387319
			  },
			  "minecraft:nether_fossil": {
				"spacing": 2,
				"separation": 1,
				"salt": 14357921
			  },
			  "minecraft:endcity": {
				"spacing": 20,
				"separation": 11,
				"salt": 10387313
			  },
			  "minecraft:igloo": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357618
			  },
			  "minecraft:fortress": {
				"spacing": 27,
				"separation": 4,
				"salt": 30084232
			  },
			  "minecraft:bastion_remnant": {
				"spacing": 27,
				"separation": 4,
				"salt": 30084232
			  },
			  "minecraft:swamp_hut": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357620
			  },
			  "minecraft:monument": {
				"spacing": 32,
				"separation": 5,
				"salt": 10387313
			  },
			  "minecraft:pillager_outpost": {
				"spacing": 32,
				"separation": 8,
				"salt": 165745296
			  },
			  "minecraft:ocean_ruin": {
				"spacing": 20,
				"separation": 8,
				"salt": 14357621
			  },
			  "minecraft:mineshaft": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:village": {
				"spacing": 32,
				"separation": 8,
				"salt": 10387312
			  },
			  "minecraft:shipwreck": {
				"spacing": 24,
				"separation": 4,
				"salt": 165745295
			  },
			  "minecraft:desert_pyramid": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357617
			  },
			  "minecraft:stronghold": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:jungle_pyramid": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357619
			  }
			}
		  },
		  "noise": {
			"density_factor": 0.0,
			"density_offset": 0.019921875,
			"simplex_surface_noise": false,
			"bottom_slide": {
			  "target": 320,
			  "size": 4,
			  "offset": -1
			},
			"size_horizontal": 1,
			"size_vertical": 2,
			"height": 128,
			"sampling": {
			  "xz_scale": 1.0,
			  "y_scale": 3.0,
			  "xz_factor": 80.0,
			  "y_factor": 60.0
			},
			"top_slide": {
			  "target": 120,
			  "size": 3,
			  "offset": 0
			}
		  },
		  "default_block": {
			"Name": "minecraft:netherrack"
		  },
		  "default_fluid": {
			"Properties": {
			  "level": "0"
			},
			"Name": "minecraft:lava"
		  }
		},
        "type": "minecraft:noise"
      }
    },
    "minecraft:the_end": {
	  "type": {
		"logical_height": 256,
		"infiniburn": "minecraft:infiniburn_end",
		"effects": "minecraft:the_end",
		"ambient_light": 0.0,
		"bed_works": false,
		"respawn_anchor_works": false,
		"has_raids": true,
		"ultrawarm": false,
		"natural": false,
		"coordinate_scale": 1.0,
		"piglin_safe": false,
		"fixed_time": 6000,
		"has_skylight": false,
		"has_ceiling": false
	  },
      "generator": {
        "biome_source": {
          "seed": 0,
          "type": "minecraft:the_end"
        },
        "seed": 0,
        "settings": {
		  "bedrock_roof_position": -10,
		  "bedrock_floor_position": -10,
		  "sea_level": 0,
		  "disable_mob_generation": true,
		  "structures": {
			"structures": {
			  "minecraft:buried_treasure": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:ruined_portal": {
				"spacing": 40,
				"separation": 15,
				"salt": 34222645
			  },
			  "minecraft:mansion": {
				"spacing": 80,
				"separation": 20,
				"salt": 10387319
			  },
			  "minecraft:nether_fossil": {
				"spacing": 2,
				"separation": 1,
				"salt": 14357921
			  },
			  "minecraft:endcity": {
				"spacing": 20,
				"separation": 11,
				"salt": 10387313
			  },
			  "minecraft:igloo": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357618
			  },
			  "minecraft:fortress": {
				"spacing": 27,
				"separation": 4,
				"salt": 30084232
			  },
			  "minecraft:bastion_remnant": {
				"spacing": 27,
				"separation": 4,
				"salt": 30084232
			  },
			  "minecraft:swamp_hut": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357620
			  },
			  "minecraft:monument": {
				"spacing": 32,
				"separation": 5,
				"salt": 10387313
			  },
			  "minecraft:pillager_outpost": {
				"spacing": 32,
				"separation": 8,
				"salt": 165745296
			  },
			  "minecraft:ocean_ruin": {
				"spacing": 20,
				"separation": 8,
				"salt": 14357621
			  },
			  "minecraft:mineshaft": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:village": {
				"spacing": 32,
				"separation": 8,
				"salt": 10387312
			  },
			  "minecraft:shipwreck": {
				"spacing": 24,
				"separation": 4,
				"salt": 165745295
			  },
			  "minecraft:desert_pyramid": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357617
			  },
			  "minecraft:stronghold": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:jungle_pyramid": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357619
			  }
			}
		  },
		  "noise": {
			"island_noise_override": true,
			"density_factor": 0.0,
			"density_offset": 0.0,
			"simplex_surface_noise": true,
			"bottom_slide": {
			  "target": -30,
			  "size": 7,
			  "offset": 1
			},
			"size_horizontal": 2,
			"size_vertical": 1,
			"height": 128,
			"sampling": {
			  "xz_scale": 2.0,
			  "y_scale": 1.0,
			  "xz_factor": 80.0,
			  "y_factor": 160.0
			},
			"top_slide": {
			  "target": -3000,
			  "size": 64,
			  "offset": -46
			}
		  },
		  "default_block": {
			"Name": "minecraft:end_stone"
		  },
		  "default_fluid": {
			"Name": "minecraft:air"
		  }
		},
        "type": "minecraft:noise"
      }
    }
  },
  "seed": 0,
  "generate_features": true
}

Quote from Greatwhitedragon»

This is more what im wanting. Can someone point me to a default world preset json for 1.16+ or better yet create one for me? I would so appreciate thank you guys for your help

This should be the default, though I am not precisely sure how to edit structure generation:

{
  "generate_features": true,
  "bonus_chest": false,
  "seed": -1162691644,
  "dimensions": {
    "minecraft:overworld": {
      "type": "minecraft:overworld",
      "generator": {
        "type": "minecraft:noise",
        "seed": -1162691644,
        "biome_source": {
          "type": "minecraft:vanilla_layered",
          "seed": -1162691644
        },
        "settings": {
          "name": "minecraft:overworld",
          "bedrock_roof_position": -10,
          "bedrock_floor_position": 0,
          "sea_level": 63,
          "disable_mob_generation": false,
          "default_block": {
            "Name": "minecraft:stone"
          },
          "default_fluid": {
            "Name": "minecraft:water",
            "Properties": {
              "level": "0"
            }
          },
          "noise": {
            "min_y": 0,
            "height": 256,
            "density_factor": 1,
            "density_offset": -0.46875,
            "size_horizontal": 1,
            "size_vertical": 2,
            "simplex_surface_noise": true,
            "random_density_offset": true,
            "sampling": {
              "xz_scale": 1,
              "y_scale": 1,
              "xz_factor": 80,
              "y_factor": 160
            },
            "bottom_slide": {
              "target": -30,
              "size": 0,
              "offset": 0
            },
            "top_slide": {
              "target": -10,
              "size": 3,
              "offset": 0
            }
          },
          "structures": {
            "structures": {}
          }
        }
      }
    },
    "minecraft:the_nether": {
      "type": "minecraft:the_nether",
      "generator": {
        "type": "minecraft:noise",
        "seed": -1162691644,
        "biome_source": {
          "type": "minecraft:multi_noise",
          "seed": -1162691644,
          "altitude_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1,
              1
            ]
          },
          "temperature_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1,
              1
            ]
          },
          "humidity_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1,
              1
            ]
          },
          "weirdness_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1,
              1
            ]
          },
          "biomes": [
            {
              "biome": "minecraft:nether_wastes",
              "parameters": {
                "altitude": 0,
                "temperature": 0,
                "humidity": 0,
                "weirdness": 0,
                "offset": 0
              }
            },
            {
              "biome": "minecraft:soul_sand_valley",
              "parameters": {
                "altitude": 0,
                "temperature": 0,
                "humidity": -0.5,
                "weirdness": 0,
                "offset": 0
              }
            },
            {
              "biome": "minecraft:crimson_forest",
              "parameters": {
                "altitude": 0,
                "temperature": 0.4,
                "humidity": 0,
                "weirdness": 0,
                "offset": 0
              }
            },
            {
              "biome": "minecraft:warped_forest",
              "parameters": {
                "altitude": 0,
                "temperature": 0,
                "humidity": 0.5,
                "weirdness": 0,
                "offset": 0.375
              }
            },
            {
              "biome": "minecraft:basalt_deltas",
              "parameters": {
                "altitude": 0,
                "temperature": -0.5,
                "humidity": 0,
                "weirdness": 0,
                "offset": 0.175
              }
            }
          ]
        },
        "settings": {
          "name": "minecraft:nether",
          "bedrock_roof_position": 0,
          "bedrock_floor_position": 0,
          "sea_level": 32,
          "disable_mob_generation": true,
          "default_block": {
            "Name": "minecraft:netherrack"
          },
          "default_fluid": {
            "Name": "minecraft:lava",
            "Properties": {
              "level": "0"
            }
          },
          "noise": {
            "min_y": 0,
            "height": 128,
            "density_factor": 0,
            "density_offset": 0.019921875,
            "size_horizontal": 1,
            "size_vertical": 2,
            "simplex_surface_noise": false,
            "random_density_offset": false,
            "sampling": {
              "xz_scale": 1,
              "y_scale": 3,
              "xz_factor": 80,
              "y_factor": 60
            },
            "bottom_slide": {
              "target": 320,
              "size": 4,
              "offset": -1
            },
            "top_slide": {
              "target": 120,
              "size": 3,
              "offset": 0
            }
          },
          "structures": {
            "structures": {}
          }
        }
      }
    },
    "minecraft:the_end": {
      "type": "minecraft:the_end",
      "generator": {
        "type": "minecraft:noise",
        "seed": -1162691644,
        "biome_source": {
          "type": "minecraft:the_end",
          "seed": -1162691644
        },
        "settings": {
          "name": "minecraft:end",
          "bedrock_roof_position": -10,
          "bedrock_floor_position": -10,
          "sea_level": 0,
          "disable_mob_generation": true,
          "default_block": {
            "Name": "minecraft:end_stone"
          },
          "default_fluid": {
            "Name": "minecraft:air"
          },
          "noise": {
            "min_y": 0,
            "height": 128,
            "density_factor": 0,
            "density_offset": 0,
            "size_horizontal": 2,
            "size_vertical": 1,
            "simplex_surface_noise": true,
            "random_density_offset": false,
            "island_noise_override": true,
            "sampling": {
              "xz_scale": 2,
              "y_scale": 1,
              "xz_factor": 80,
              "y_factor": 160
            },
            "bottom_slide": {
              "target": -30,
              "size": 7,
              "offset": 1
            },
            "top_slide": {
              "target": -3000,
              "size": 64,
              "offset": -46
            }
          },
          "structures": {
            "structures": {}
          }
        }
      }
    }
  }
}

If you're playing 1.16 or later, you can simply use custom world generation through a JSOn file - Much easier than trying to mod yourself, and you can even create your own structures if you want. https://minecraft.gamepedia.com/Custom

This particular use case could easily be implemented through tags, but the concepts are incredibly useful for all sorts of stuff.

Quote from GerbilCrab475»

Um, water in caldrons can't make obsidian. It can be used for potions though and constantly going back to the overworld just to get water is kinda annoying when your base is in the Nether.

You can take the water from the cauldron into a bucket. It won't work in that case (the water will evaporate), but there's still a clear intention here not to have water access in the nether.

Quote from GerbilCrab475»

How unfortunate. Stalactites don't fill caldrons unless there is a water/lava source above them. This means that caldrons cannot be filled with water in the Nether. Renewable lava is nice but I was looking forward to a better access to water in the Nether.

I think part of the whole point of the nether is that water sources aren't available, especially when you consider that if it was, obsidian would be far too common and striders would become irrelevant. It also fits in the entire theme of the nether that it's supposed to be hot and relatively inhospitable. I doubt they would have kept such a feature even if it had existed in the first place.

Quote from Violette123»

I just updated to 20w48a.

The first thing I noted is the compass and the clock.

I can't find what's changed in 20w48a in Minecraft main page and wiki.

They added stalagmites, stalactites, a new bundle mechanic, and freeze damage gamerule.