yugioh umbral deck DBJH-AE051 Number C104: Horror Masquerade (P-N) – TCG Corner Umbral Horror Ghost | How

In Lorcana, exert is used in lots of ways: You exert ink when you use it to pay a cards ink cost You exert characters when you quest , challenge , or sing Some items get exerted as a cost when they are used Some cards or characters have abilities that require them to be exerted to use them Certain actions and abilities can exert other players cards When a card is exerted, they cant take any other actions unless they are readied by an effect

If you set it yourself, it will become an extremely powerful monster in terms of battle due to the effect of halving ATK and negate effect

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This proves that the person who possesses this card participated in the Secret Super Battle Best in Japan Deciding Match. Thanks, Bulbapedia