Btvs 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.

Professor Oliver Seidel, adept at using summoning and portal opening spells to deal with rivals and enemies, summoned a Voynok to kill Angel.