|Although this article is based on canonical information, the actual name of this subject is conjectural.|
- "Barathrum copeo lacero. Increpito immanis barathrum copeo lacero."
- ―Professor Seidel[src]
The Voynok Demon Summoning Spell was a spell employed to summon a Voynok Demon, apparently under the control of the caster. After a brief Latin chanting, a portal would be opened and a single Voynok Demon would emerge from it.