Delivered from Madness

Steps:

Hail him for unintelligible speech. Speak to Ghrix Si'lith, who now has a quest. 1. Search Warslik's Woods for 8 antivenin Redscale Pitcher Leaves. 2.   Return to Savix'Host and make him take the medicine. Hail him.
 * Note: This is a small dark bluish-black plant that is not trackable. They are abundant in the Warslik's Woods area between Nye'Caelona, Slaver's Point, and Warslik's Woods poi's on the map. I didn't find any at all near Chalp or Twark areas of Warslik's Woods.

3. Take him to Crusader's Cave. 4. Hail Crusader Tarrac (648, 247, 1252).
 * Note: You can fly to escort him there. Update happened around roughly (639, 247, 1224) (I had to be landed on ground and coming to the update point for it to happen.)