No one knows whence they came from. All any scholar has ever uncovered is that they are as old as Death itself. The ever-present antithesis of life. Corrupted, soulless, infinite.
Some consider them to be nothing more and nothing less than a part of the natural order. Not evil, nor good. Simply what remains of a soulless vessel that used to hold life.
Others, see them as the epitome of evil. Eternal servants of the Unholy Gods. A twisted abomination created to mock life.
The truth, it seems, is somewhere in-between. Some ghosts and geists exist as sad reminders of what was. Harmless, floating memories. Others are drawn to positive emotions seeking to destroy or devour.