Really... That might fix a couple of problems I have camping IDOCs.
Yeah but you can still be tracked and revealed, then you're a sitting duck with no mounted speed if you cant go offensive too.
It is really nice when doing a spawn, you never get trapped in it, and you can escape PK's if there are many monsters for them to navigate through. ( Just dont cast wither as your defense against them, as you'll be clearing a path for them to follow you )
Also, in wraith form, you have mana leech.
So if doing a coon spawn, you can wither away to your hearts content, never losing mana ( if you hit enough monsters with each casting ).
Scorpions do not have mana to leech.