Uccastrog

Uccastrog, the Isle of the Torturers, is a located off the fictional continent of Zothique in the work of Clark Ashton Smith. It's king is Ildrac and as the name suggests is noted for the sadistic inclinations of its inhabitants.

In "The Isle of the Torturers" the king of devastated Yoros Fulbra lands there and brings the Silver Death upon the island by tricking Ildrac into removing Vemdeez's ring from his finger.