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Antimagic, when used as a spell, is the worst! (except in battles against mages, beholder, and other warlocks)
It prevents healing, temporarily disables Zone of Bliss, phoenixes don't resurrect, angels don't revive, and so on.
But it doesn't necessarily have to be cast on angels... It's better to cast it on those who are in the thick of the battle and don't have the ability to resurrect. Also, Antimagic probably removes curses. If they've already been cast...