More Structures Command Block 1.12.2, 1.11.2 adds 7 structures (4 in the overworld, 2 in the nether and 1 in the end). You can change the structures to whatever you want. Some include random loot and mobs.
Piston Boots Command Block 1.12.2 adds Piston Boots to Minecraft. The Piston Boots is an item added by Adventure Backpack that is a bouncy pair of shoes for adventurers.