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Secret Mouth

2nd-level transmutation (formula)

Casting Time: 5 hours (5 phases of 1 hour when cast as a formula)

Range: Touch

Components: V, S, M (rare herbs and oils worth 250 gp, which the spell consumes if cast in lasting mode), SC (the target)

Formula Ability Checks: Intelligence with alchemist’s supplies DC 13, Wisdom (Medicine) DC 13, Intelligence with alchemist’s supplies or Wisdom (Medicine) DC 15

Formula Backlash: One level of exhaustion

Formula Failure: Target is reduced to 0 hit points and begins dying

Duration: 8 hours or instantaneous

With this Tcho-Tcho technique, you cause an extra mouth to grow somewhere on the body of a willing or immobilized creature that you perform surgery upon during the casting time. Commonly, this mouth grows on the palm of one hand, but its location is up to you. The secret mouth can speak, breathe, and eat. It is fanged, and thus able to inflict significant damage. The target can make an unarmed strike using the appropriate limb to bite. When it does, the unarmed strike deals 1d4 piercing damage and has the light and finesse properties. The bite is not innately venomous, but a Tcho-Tcho Okkator is able to hollow out the fangs of the secret mouth and place poison within them and others can use the spell venomous fangs to permanently add a venom gland.

You can cast this spell in one of two modes: temporary or lasting.

Temporary. When you cast this spell in temporary mode, it lasts 8 hours. When cast this way, the spell doesn’t consume the material components.

Lasting. When you cast this spell in lasting mode, it is instantaneous, leaving the creature’s body indefinitely modified thereafter. When cast this way, the spell consumes the material components.

Remove curse, restoration, or similar magic can remove the secret mouth if the target is willing to have it removed.

Section 15: Copyright Notice

Sandy Petersen’s Cthulhu Mythos, © 2018, Petersen Games; Authors: Sandy Petersen, David N. Ross, James Jacobs, Arthur Petersen, Ian Starcher.