My idea was having a dungeon that was almost like a underground graveyard or a series of caves that spawn only skeletons like Skeletal swords men (if they existed), Bowmen and spider jockeys that roam it. and there are random chests scattered around in the cave systems that you would find. You could also have it so there would be a VERY RARE item which would have a 0.10% chance of having in a chest, This would be a Necklace or ring which would increase power or regain health overtime faster than usual at full hunger. That's my idea for now thanks for reading!
how about strongholds?
But ive been in one. Twice. there boring. and horribly buggy/deformed.
ya you do have a point their strongholds are very easy to survive in especially with all the natural torches