Ask Mr. Owl... In all seriousness I dislike unique Limited Edition runes that don't have an exact (or almost exact) counterpart. TLDR- trade for it at the moment
What really threw me was that it doesn't seem to be on Poxbox (even as an Out of Stock rune). Also, I agree regarding limited runes that don't have a non-limited counterpart.
Yeah, Haunting Spirit is in the Disturbed spirit rune category so it doesn't show up. I wish the two were as follows: Disturbed Spirit: Spd 4 HP 30 Ghost Latch on Upgrade 1: Depression Possess 2 Possess 3 Upgrade 2: Sonic Aura 2 Vulnerability Magical Haunt 3 Haunting Spirit: Same as Disturbed spirit above except it has taunt: DOOM base... and maybe a recolor
Haunt ability should die in a fire for all I care. Even at 0 nora I would not run it and it cost what? 10+
Honestly, I'd be happy with Disturbed Spirit just being a copy of Haunting Spirit (and then giving Haunting Spirit Taunt or something).