This mod allows endermen to pick up any block.
Endermen holding obsidian and end stone on the main end island.
Look at them, leaving all the trees floating >:(
Two endermen in the nether wastes, holding fire and netherrack respectively.
Enderman in a dungeon holding a spawner
An enderman in a deepslate cave, holding diamond ore.
This is NOT a feature of the mod, this was a world made to test during development, and I'm using it to showcase them picking up unbreakable blocks.