If hardcore is to easy for you, or you just want to try something different without learning a bunch of mods, this is a mod pack made specifically for that. It doesn't aim to add a bunch of new random items or magic systems or technology, it just adds some changes that should give a more intense Vanilla experience. Caves are now pitch black, rather than just dark, ores are slightly more scarce, but still generate like vanilla, and torches will burn out over time.
In addition, it provides some (disableable) aesthetic mods to make the world feel more alive. Better Grass and Leaves makes the foliage look lush, and MAtmos (the annoying or non vanilla sounds have been disabled) adds some natural ambiance. Again, both of these can be disabled ingame.
I think that I will move this modpack to Curseforge, Technic has a lot of problems with it. I will also update it soon, removing the block hardness modifier and making torches craft lit rather than unlit.