That could be direct damage via cards like Impact Tremors and Goblin Bombardment or finishers like Akroma's Will to give your team evasion
If exerted be that through singing, questing, using one of their abilities or other reasons in another players turn these characters can be challenged, requiring the challenger to exert their own card and then resulting in both characters simultaneously applying their strength to their rivals willpower
Most prominent is Hope's Ninurta: in FFXIII , it's a first-tier (out of three) weapon and widely considered to be one of his worst boomerangsand it's his Burst Soul Break weapon
This works best at the highest power levels, where players throw around spells like Force of Will and various Moxen that Lavinia counters
Infernity Doom Archfiend allows you to target an opponent's Monster and negate its effects for the turn
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