Wraith (Wesnoth)

Wraiths are a type of ghost featured in The Battle for Wesnoth.

Description
Wraiths are a type of spirit created by a Necromancer. They are the spirit of a dead warrior, brought back as a slave to the Necromancer's will. They are able to attack with their swords, their deadly wail, or simply their cold touch. Swords phase through them without hurting them. They are not invincible however, as it is vulnerable to fire and to magical attacks.