ClassLegendary Elemental Warrior.
Member + Non-Mem
Complete Warlic's "Elements of Research" quest from /dragonrune by defeating each Elemental type at /dragonplane or /gilead (depending on what you find faster).
Complete Warlic's "Elemental Mastery: Study Session" quest from /dragonrune. Complete it alongside the quest from the above section in the same manner.