Fang trap

Fang trap was an abjuration spell that created a spectral set of fanged jaws, which bit down upon any designated creature that passed over an area or manipulated a certain object.

Effects
The spell functioned in a similar manner to the more common glyph of warding in that it created an invisible, magical trigger that would activate when the right conditions were met. A fang trap was traced over an physical object, such as the handle of a door, a chest, or area on the ground as conditions were determined as to who could spring the trap.

The trigger could not differentiate people of different faith or alignment, but could distinguish between different races, such as scaled ones or other humanoids. The condition could also be quite specific such as those wearing certain items, e.g. someone wearing exactly "six metal rings" upon their fingers. The caster of the spell could never be caught within their own fang trap.

Once sprung, a fang trap immobilized its target and, unless they resisted the effect, a spectral set of fanged jaws bit down upon them.

Casting
The spell required the use of a divine focus by clerics or the material component of a single fang, extracted from a snake, in the case of arcane spellcasters.