The novelty of finding caves wore off a long time ago. They're everywhere in the game now. You usually only have to walk a short distance from the starting point. Also, it's likely that the first cave you find is the only one you ever need to find. With the addition of ravines, if you explore every branch within the cave (including digging out dirt and gravel filled tunnels) tunnels tend to branch just slightly more often than they terminate. If you want to go cave exploring, you never need to find a brand new cave.
At first I was going to suggest just making them much less common, but a more interesting solution would be to mirror reality, and have caves confined to specific areas. Real caves form where large masses of soluble rock like limestone and marble are present. Although Minecraft doesn't differentiate different types of rock, this effect can be simulated by making a biome specifically for caves (and with the huge biomes in the current version, you can still get some pretty extensive caves).
A karst biome surface would be mostly grass-covered with a few scattered trees. The landscape would be low hills that are jagged in places, with cliffs and sharp pointy spires (as influenced by some of the biggest karst areas in east Asia). And of course there would be cave openings.
This would really help separate the concepts of mining in caves and having to just mine the rock. Finding an area with caves would be great if you want faster access to ores. On the other hand, non-karst biomes would be better suited for regular mining to get stone blocks and not have to worry as much about opening caves while mining. I guess there should probably still be patches of dirt and gravel in non-karst biomes, but no open air passages.
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The New American Republic, or N.A.R, want to take back America with their own strict rules.
They kill those against them and have been known to jail people for no reason. They're a strict military like group, their ranks are very much like the army's. Starting from Enlisted, Recruit, Sargent, Captain, General.
Can tax citizens.
Can jail people for anything.
The Church Of Retribution is a post-war made station under the old church. They believe that there is hope and not all is lost. They worship a new god named Hegios, believing he is the light in the dark and will smash down those against the church. They've been at war with N.A.R since their start. Their ranks are: Priest, Bishop, Archbishops, Cardinals, Pope.
Can use magic powers granted by Hegios (teleport,heal)
Can make potions
More coming soon.
Smith:
Makes armor.
Makes weapons.
Can repair tools.
Ranger:
Only ones that can go on the surface.
Can use iron+ armor.
Can make gas masks and fillters.*
Bandits:
Can mug people.
Only can live in abandoned tunnels/caves.
Can kidnap/enslave people
Can attack stations without needing to be in a faction.
Tunnel Workers:
Can use /kit to get picks and other tunnel supplies.
Can be hired by admins or factions to make more tunnels.
Can open the Maintenance doors.
*Not yet available, if you can code this in bukkit/spout that'd be amazing.
Work in progress
M= Major station S= Small station. Bottom middle is the first station done, A.K.A Swan Station. Each grid block is about 15 blocks only for tunnels though!
Working on the rails from Swan Station to the next two stations.
Working on buildings in Swan Station.
Fusion711 is in charge of tunnel building.
Follow the map 100%