Btvs Although this article is based on canonical information, the actual name of this subject is conjectural.
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Catherine's curse deflected by a mirror

I shall look upon my enemy - I shall look upon her and the dark place will have her soul! Corseth! Take her!
―Catherine Madison[src]

An Imprisonment Curse was a spell that would call upon the deity Corseth to trap the soul of the target with an object, also obliterating the target's body in a painful process. The victim would remain trapped within the object, fully aware and capable of perceiving the world around him/her.

The spell manifested as small burst of energy that would swirl around the caster's body, and then coalesce into a single mass of energy that would blast against the target. The energy blast could be deflected by a mirror. If the caster was caught by the energy, he/she would suffer the curse's effects.


Catherine suffering the effects of her own curse

The witch Catherine Madison performed this curse and tried to use it against Buffy Summers. However, the Slayer deflected the spell with a mirror, which caused Catherine to be caught by her own curse. As a result, Catherine's sould was trapped within her cheerleading trophy.