Mask of Aberration

The Mask of Aberration was an artifact known within the ancient Imaskar Empire. It was once thought to be one of the Imaskarcana.

History
An alliance of Imaskari archwizards known as the Cabal of Madness created a number of masks known as the Faces of Madness, each themed around a school of magic, over decades after striking a bargain with horrors from beyond their world. The Mask of Aberration was one of them. Each of those major artifacts were created with a curse that only the creator knew how to avoid. Before they were able to implement their plans, however, the Mulan rebelled with the aid of their gods, ultimately destroying Imaskar as a nation. In the resulting tumult, the masks were scattered.

Appearance
The Mask of Aberration was a ghastly patchwork of the skin of creatures altered by transmutation magic. It wrapped around the wearer's head and was buttoned up the back. The patchwork bits moved around randomly at unpredictable times.

Powers
The Mask of Aberration granted an overwhelmingly powerful resistance to all spells of the Transmutation school. It allowed the user to cast such spells with an amazing level of penetration of innate resistances. The wearer could also employ passwall thrice a day, or more, depending on their force of personality. They were also granted a continuous ability to walk up walls and even across the ceiling, as per a spider climb spell. Finally, they got the ability to cast, thrice a day, their choice of haste, polymorph other, disintegrate, polymorph self, iron body, and Tenser's transformation.

However, every time the mask was donned, a wearer ran the risk of being transformed into a gibbering mouther were their fortitude to fail them, eliminating their original memories and personalities in the process. Though a polymorph other spell could restore their form, their memories would require a limited wish or remove curse cast with at least the same level of power as the mask itself commanded in order to be restored.