Ruined Cave Tomb

Cave tombs would spawn in caves, maybe the large ones.  Fractured and broken, parkour might be the name of the game. Collapsed rubble might block a walkway, leaving you to pass through cracks in the walls. Drip stone stalagmites await unlucky players who fall. Rocky outcrops may lead you to the next corridor. You may need to climb vines growing on the tomb. Water basins line the halls, stalked by zombies and skeletons. Chiseled blocks, statues, and water features await the player. The treasure room could have a warrior skeleton, the remains of great warrior, brought to life. He would sit on a throne, wearing unique armor, and carry a sword and shield. He could drop his chest plate as a reward. This would be uncraftable armour. No idea what else would make it special, but could be a cosmetic armour piece. It would be cool to find this as you wander the new caves. I think new items like water spouts, fountains, lion heads spewing water, and simple water basins would be great to build with, especially if they were compacted to one block. Double points if it can be swapped with lava. Also lava logged items would be cool.