Sayl's particular mutation has turned his head into a lumpen inhuman mass of boiling flesh, opening in a single baleful eye which stares through the mortal realm into the spheres beyond time and matter.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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This preternatural vision and precognition means that any Characteristic test Sayl fails can be re-rolled and he channels Power dice on a 3+.