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Emperor Emperor is a multiplayer format where two or more teams of three players face off with the goal of eliminating the opposite teams designated Emperor. The Emperor always sits in between the other players on their team

Retrieved May 23, 2022

Until the End Phase Armor monsters you control cannot be destroyed by battle or your opponent's card effects and neither player takes battle damage from battle involving Armor monsters

By itself, this card seems good, but not enough to fit in the meta, but then, Hisuian Braviary and the Panic Mask appeared, and the result was a deck that can decide matches with a couple of attacks