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Btvs Although this article is based on canonical information, the actual name of this subject is conjectural.
Kali, Hera, Kronos, Thonic.
Air like nectar, thick as onyx.
Cassiel, by your second star,
Hold mine victim as in tar.
Willow Rosenberg[src]
Air Thicken

Willow using the spell on Glory.

This spell was found by Willow Rosenberg in a tome named the Darkest Magick in Giles' off-limits stack in the Magic Box.


A powerful incantation that invoked a number of deities, it was meant to contain someone by turning the air around them as thick as tar. Willow used it in a battle against Glory, and it turned out to be strong enough to immobilize even the Hell-Goddess, who had until then seemed to be an unstoppable force.

This spell involved calling upon five Deities: Kali, Hera, Kronos, Thonic, and Cassiel. However, it was shown that the witch could later reactivate the spell without the need to re-invoke the Deities - instead, she would only need to say "thicken" along with a hand gesture.

It remains unknown as to how long this spell is able to contain its victim before the witch had to recite the invocation again.

See also