Forbidden Call (3.5e Spell)

You use your enemy as a conduit to the forbidden madness of the far realm, summoning That Which Should Not Be through them. On a successful Fortitude save, the target takes 5d6 points of damage, on a failed save the target's eyes sink into darkness, tentacles of smoke tear from their body, and their own face eats itself while weeping rivers of black tar, culminating in their body imploding, becoming the grotesque gateway into the far realm where a nameless elder evil lies in wait. All those within 20 ft. of where the target perished must succeed on a Will saving throw, or become sickened for as long as they remain in the area + 10 rounds afterward, save negates. If they fail the Will save they must immediately make a Fortitude save or suffer the same fate as the first, perishing in an unspeakable manner as the elder evil draws them into the swirling gate.

The 20 ft radius area is cursed, becoming warped and mutated for the spell duration. Any creatures which end their turn within its area are subject to making a Will and Fortitude save. A gate spell cast upon the area dispels Forbidden Call, and a magic circle against X spell cast in as it's inward-facing form shrinks the cursed area to the size of the actual portal (the former square of the target creature, which is a 5 ft square if the victim was medium sized).