Demon power

But a longer arm shot across the altar and a misshapen hand locked on his throat. Screaming and fighting, the high priest was dragged back across the altar; a hammer-like fist smashed down, and Gorulga's cries were stilled. Limp and broken he sagged cross the altar; his brains oozing from his crushed skull.
-	The Jewels of Gwahlur (chapter 4)