Acquire an Ichor of Undeath for Ogtinc in Azshara. Ogtinc resides atop the cliffs northeast the Ruins of Eldarath.
For this restorative salve, you must use a simple formula: one part poison, two parts cure. You have acquired one cure, now you must gather the poison.
Powerful undead, such as the lingering highborne who wander the Ruins of Eldarath, are sometimes so infused with evil that it coalesces into a sickly greenish goo. To the living, this substance is known as ichor of undeath.
Due to the potency of this vile element, I require only a single ichor.