In Japanese mythology, an ikiryō (生霊?) (also read shōryō, seirei, or ikisudama) is a manifestation of the soul of a living person separately from their body.
Traditionally, if someone holds a sufficient grudge against another person, it is believed that a part or the whole of their soul can temporarily leave their body and appear before the target of their hate in order to curse or otherwise harm them.
Souls are also believed to leave a living body when the body is extremely sick or comatose; such ikiryō are not malevolent.
— This comes off the WikiPedia again —
Some ideas spark from this one, though for me they are a bit vauge in how a treatment or stoy-line would use this type of ,,, what is this, transcendental meditation achieved by rage? Soul Screaming? .. that’s kind of cool, I like that.. Maybe just Ghost Scream. … k… cool name… still no solid value in a treatment… have to give this some thought, but I’m sure it is going to germinate soon. Maybe I’ll post it in the White Wolf forum and see if a sin-eater can push me in the right direction.
The idea of Rage Manifesting the Soul of the Living, in order to travel across space and curse at the focus of its immortal anger, is definitely worth a treatment of some kind however. Probably a full storyline. This is not a cow-tipping event.
It is in the same leage, perhaps as the faerie Banshee, only with rage instead of death. I really like the malice involved, however, in expending this kind of energy, just to show up in someone’s living room to scream…“I FUCKING HATE YOU!“, and travel back to your body… wow.. that is really … well.. it’s insane is what it is.. I love it.