First, he had made a new arm for Borkus. Using【Golem Transmutation】, he gathered Borkus’s broken bones that were lying in the audience chamber and restored their shape. After that, he placed the bones against Borkus’s shoulder and poured Mana into them with the image of restoring the arm in his mind.
And then flesh sprouted and expanded from Borkus’s shoulder and his arm was restored!

『UOOH, this feels disgusting!』(Borkus)

He received this kind of overreaction, however.

It seemed that death-attribute magic was capable of restoring not only the bones that made up the bodies of Bone Man and the other Undead, but flesh and skin as well. He decided to name this ability【Corpse Healing.】

But the right half of Borkus’s face couldn’t be restored. This was possibly because holding an image in one’s mind was important when using magic, and the image of Borkus’s half-skull face had already left a deep impression in Vandalieu’s mind.