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: The Scions of the Tower - The Tower's Victims - Fenn's Job - Narius' Plan - The Adana Problem - The Source of Rot - A Rotten Heart - The Fall of Lord Bayle
Mission Quest Chain: The Doomscale Horde - The Defense of Lendiniara | Xulous Prime - The Legacy of Bayle | Saving Jacyll | Houses of Thex - Hate Rising | The Fall of Lord Bayle | Burn Out - A Guide Beyond the Rift - The Journey Home