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|When any player rolls a 2, that player takes 2 damage.|
Cursed Horf is a cursed monster card.
While playing as Judas, you can use his starting item, the Book of Belial, to force a player to change a one or three into a two and force them to take the damage. If you are playing as The Forgotten you could also remove a counter from their starting item The Bone, and change a one to a two.
Since Cursed Horf's effect states "when ANY player rolls a 2," that means it's effect is active even when not being attacked.