The undead are very rare, until recently, when the meddling of the Shadowed Skull began to make them somewhat commonplace through The Purple, a drug which seems to raise those who become addicted after their death.
The Brotherhood believes that to tamper with life and death is the greatest form of heresy, as that power was once a divine one, which was supposedly sealed away to prevent its misuse, as it could only corrupt. This is why any magic users which have meddled in this have received the brunt of The Brotherhood’s hatred, while they do abide most magic users. This has led to Necromancy being officially illegal in most nations, while still being practiced in rare cases. In the case of the Tarean Empire, many mages weave necromantic principles into their soulbindings, although very few know of ways to perform true necromancy. Most who know of it only dabble in a few small parts.