Could this character survive these grievous injuries?

I have a new fantasy western world and made a sort of antihero character for it, the Dead Man. He got this title because he survived an attack from 3 assassins. However, I'm wondering if I am pushing believability with the injuries he sustained.

He was first hit in the head by an averaged sized rock controlled by a druid, this injury left a small scar as well as a tiny dent in his skull. He was then shot in the chest with magical lightning from a sorcerer that left a scar in this pattern and possibly affected his heart. The last injury was a single long cut from a knife from the right side of his neck down to the upper right of his chest. I should also note that these injuries are somewhat symbolic among these assassins, but were rushed in this case.

The lore right now is that he was saved by this world's equivalent of Native Americans and spent months healing and training. Medicine is at differing levels of effectiveness depending on who your healer is. So, do you think these injuries are survivable or are they too much to be believed?