I have reduced the ichor you brought me and separated it into its base components. My findings are not conclusive, but I have determined that warlock and necromantic magics were used in the ichor's creation.
While I continue to study the ichor, I want you to take a sample to Bethor Iceshard in the Undercity. Bethor is not an apothecary, but his knowledge of magic may help to unravel the mystery of the rot hides.
Go. You will find Bethor in the Magic Quarter of the Undercity.