Blurred Form. Attack rolls against the eidolon are made with disadvantage unless the eidolon is incapacitated.
Incorporeal Movement. The eidolon can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Turn Resistance. The eidolon has advantage on saving throws against any effect that turns undead.
Multiattack. The eidolon makes two ghostblade attacks.
Ghostblade. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit:8 (1d8 + 3) slashing damage plus 11 (2d10) force damage.
When a mortal soul traumatically sacrifices its identity in order to escape the Underworld as a Returned, its identity manifests as a spirit-like eidolon. While eidolons possess many of the skills and details related to their past lives, they're disconnected from those experiences, choosing to wander the world or brood in haunts they're drawn to in death. They care nothing for morbid reunions with their lost bodies or Returned remnants.