Dark Sun, The Scorched World of Athas
In an environment where violent death is so common, ghosts frequently haunt sites of great significance or terrible slaughter. Among them are an array of spirits bound to the service of long-forgotten gods. Called raaigs, these ghosts defend ancient shrines, temples, relics and secrets.
Beyond the ranks of undead guardians stands a phantasmal figure clad in heavy armor and a rich mantle. Medallions of office mark it as the spirit of a high priest or temple champion. These creatures fight alongside other raaigs, directing the battle.
Formed of swirling dust, the tomb spirit takes the form of a human clad in ancient armor. It strikes, and its ghostly weapons solidify and slice cleanly through flesh and bone with a supernatural chill.