Vrisk

Vrisk's smooth head does not have ears, so he's Deaf. He automatically critically fails any Perception checks that require hearing and is immune to auditory effects. He can supply verbal components for casting spells and command components for activating magic items, but if he performs an action he isn't accustomed to that involves auditory elements, he must succeed at a DC 5 flat or the action is lost. He has both the Sign Language and Read Lips skill feats.

Harmed by void (3d8 untyped, 2d8 untyped from areas or persistent damage); healed by vitality (area 2d6 healing HP); slowed by emotion

Vrisk is affected by the Daze spell as if he was a living creature

If targeted by Redact or any other spell that erases text, Vrisk must succeed at a DC 20 will save or immediately die as the rune on his forehead is erased.