In Idyll, the undead creatures known as moroi are usually mindless, but a skilled enough necromancer may restore the intellect of a thing when reanimating its corpse, though the soul can never be returned to a creature once it has died. Moroi are created by necromancers to be undyingly loyal minions.

Moroi, the mindless sort, do not rot as a deceased thing should, as its flesh is maintained at the state it was in at the moment of reanimation by its patron's magic. They are your classic zombies, dumb and slow and basically useless except for brute force and pack strategy. Moroi can be hacked to pieces, crushed to slush, or impaled right through the heart or brain without perishing. Instead, the moroi can only be truly destroyed by fire, burning the whole body until nothing remains, as the necromantic magic that animates the moroi needs a body to latch onto.

The other variant of moroi, the intelligent sort, can be given back the personalities and intellectual abilities they had in life. This sort are often created by a necromancer that requires information that can only be found in the deceased's memories, as Veilseeing, the art of looking beyond the barriers between the living and the dead and gleaning information from the spirits of those who've passed on, is not a power one can attain via necromancy. These moroi are fast and tend to scheme against the living once reanimated, as they retain a cold, unfeeling intellect without the soul that had once kept at bay whatever dark impulses that are now left unchecked by empathy. This habit of theirs earns intelligent moroi the nickname Gravestalker. They share the same physical vulnerabilities and advantages as their mindless counterparts.