Tasks go in - order, if an | exists it means you can do those in any order, but have to all be done to continue on to the end. If tasks aren't listed in a chain, they can be done at any time.

Mission Quest Chain: Scaring Up Some Information - Indoctrination - The Sacrifice - The Sweet Taste of Revenge - Confronting Your Fears - Defeat Zeixshi-Kar
Mercenary Quest Chain: This Can't Be Good! (East Wastes: Zeixshi-Kar's Awakening) - Stalking the Shadows (Crystal Caverns: Fragment of Fear) - Masters of Fear (Kael Drakkel: The King's Madness)