Obtainable by talking to Ghost of a Priest in the 4th mission of the Wrath of the Emperor Quest, finishing Blood Brothers Quest up to mission 5, Ice Islands Quest until mission Formorgar Mines 1 and maybe exchange one for Kissing a Pig Quest until mission 5.
You don't hunt them, you talk to them. You know that ghosts might keep secrets that have been long lost among the living, and you're skilled at talking them into revealing them to you.
