Humans are the only race gifted with a natural ability to summon outsiders, though it comes at great cost.
(Each human has the ability to cast Magic Circle as a ritual (not as a regular spell and only the containment version) though you must roll the target's HD
and take that much damage spread amongst as many humans as are willing to share the cost.)
(The wizard casting the spell can spend a single spell slot to reduce the damage by 1d8 per level of the spell slot used.)
(For a Chain Devil, Bone Devil, Horned devil, Erinyes, Ice devil, or Pit Fiend, there must be at least one person sacrificed completely)

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