Necromancers are able to summon spirits of the dead and raise corpses. However, necromancers don't always summon spirits. A spirit can identify a necromancer by their "glow". A necromancer's glow indicates their power, so the brighter the glow, the more powerful the necromancer and vice versa. Most necromancers use rituals and concoctions to summon and dismiss spirits and raise the dead, but Chloe Saunders, a young necromancer, has the ability to raise the dead without trying.
Necromancers of the Otherworld.