The general consensus is: the soul moves on after death, their magic lingers as a spirit if strong enough, and the body itself is an empty shell, so there isn't too much of a taboo around using corpses or spirits.

There are some taboos on graverobbing and some people receive blessings during funeral rites that prevent them from being raised because they don't want to have their family see their body wandering around. He might need to head out of town to find usable bodies or spirits; there'll be quite a few in the icy wastes from long-dead travellers and adventurers.