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These are extra mechanics added by plugins on the server. They aim to make some Quality of Life changes.
Drop an elytra and a chestplate onto an anvil to combine them into an Armored Elytra.
Dropping the Armored Elytra onto a grindstone separates them back into individual items.
Drop powered concrete (or stacks) in a cauldron containing water to convert it into solidified concrete.
Drop Dirt (or stacks) in a cauldron containing water to convert it into Mud.