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The Duplication Grenade is a tool from Witchery. It can be used, with the use key or a Dispenser, in order to spawn a duplicate of its bound entity. This will usually redirect hostile mobs from the actual entity to the duplicate.
When bound, its tooltip will say "Reflection of: Player", where "Player" is the player's name. If it is not bound to anyone, "Player" will be "null".