Wrap Trap

Priest of King Kartan, ruler of the Sands of Time
Accidentally killed the Princess when she rejected him & threatened to tell her father
Defiled the Temple of the Sun by attempting to raise her from the dead
Stopped by Kartan, mummified alive when the King used the Netherworld Scroll
Awakened eons later, by Hordak & Shadow Weaver, served the Horde
Controlled by whoever holds the Netherworld scroll