Aramil issued a long, heroic challenge, then the lich felled him with a single word.

Power Word Kill

Destroy target non-Angel, non-Demon, non-Devil, non-Dragon creature.

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A creature is a legal target for Power Word Kill if it doesn't have any of these four creature types. If it has one of these four creature types, it's not a legal target, even if it also has a creature type that's not among these four. For example, a Demon Rogue is not a valid target for this spell.