Wraiths can be found anywhere a corpse has been.
They are like undead creatures, some roaming during the night, some under the sun. They are usually what was left of a human's spirit after a gruesome death and they are only formed when they had enough spirituality and grudge before their death.
Some of them are under the services of those who summons them in exchange for a price. What wraiths usually prefer as payments can defer from body parts to living souls.
Wraiths can cast a variety of spells depending on their level and their purity. Most wraiths born for a week are able to use a single spell as defense or offense against danger.
Their spells vary from telekinesis, life-drain, specter summoning, Invisibility, slash attacks, and so on...
Beware of these ghosts!