Udeni's Summon Tarrasque

A Tarrasque appears in a space up to 1000 miles away from the point at which this spell is cast. The Tarrasque is hostile to all creatures other than itself.

"The Ultimate Fail-safe. While killing a Tarrasque may be neigh impossible, the Weave can allow us to circumvent traditional restrictions of material components, using a live being as this spell's component."