Death Frenzy

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A kill by you or your undead fills you with a death frenzy for three rounds; each kill within it stacks it again (up to three) and starts the three rounds over. While it lasts your spells take a half, a third or a quarter of their usual time to cast, and each of your undead swings once more a round. When it runs out, it rests for 30 seconds before the next kill can start it again.

See also: NECROMANCER