Just cast, or cast other person/creature.
It's more for removing buffs, than removing debuffs.
Also, Ward Break is more for barrier spells.
It doesn't work on everything, like you can't dispel cyclic buffs, and I'm not sure it'd work on a curse.
There might just be some things it can't break either as intended or buggy.
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An agonizing pain fills you as you feel your tongue turn to powder in your mouth! Through a haze of uncertainty and loss, you realize that something you just said was very wrong.