=Lizard=
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Since there's already resistance in the game, wouldn't it make sense to implement a system where, when a hero with resistance uses a spell like Armageddon or Wave of Death, the damage dealt to their own units is reduced? Otherwise, it doesn't make sense: Thorgrim, casting Armageddon, damages his own units just as much as the enemy's, or even more (if the opponent also has resistance)!