Complete Loremaster Maya's "Embrace Your Chaos" quest from /mountdoomskull by defeating enemies in the same map. This is most efficiently done if you keep walking until you reach the screen with 2 Chaorrupted Rogues and 2 Chaos Drows.
Also make sure to enable Quest Log Turn-Ins and Reaccept Quest After Turn-In from Advanced Options. This way you can keep your Quest Log open and turn in quests from there. You can access your Quest Log by pressing L.