So due to a set of bad rolls the psyker in the groupe end up taking 11 E crit damage too his head. seeing as he had fate points and desired to burn one to stay alive i ruled that instead of losing his head completely he would have his face was burned away meaning he lost his eyes, ears, noses, and mouth.
So mechanically he's suffering deafness, blindness, 12 points of permanent Fel damage (I had him roll 2d10), and he can not speak. This isn't quite as debilitating as it sound as he has Warp perception and i will let him used that to "see" the world around him with the draw back the if anyone looks into his eye sockets well he use it the will be at risk of taking corruption points as there looking into the warp.
So i guess my question is does this sound fair, should i inflict less penalties or more, i was thinking of having him take Toughness test to be able to breath/move. how have you handle this situation before.