Talk to Modryn Oreyn and he will tell you that he has a mission to talk to you about, but wants to do it in private. Meet him at his house later and he will tell you about a failed Fighters Guild mission that the Blackwood Company completed. He wants your help investigating whether or not the target, Azani Blackheart, was actually killed. When you accept the quest, he will tell you to meet him in the Leyawiin Fighters Guild. Travel there, meet with Modryn, and then travel to the ruin of Arpenia, northeast of Leyawiin. Once you get there, Modryn decides that Azani must have moved his base of operations to Atatar to the northeast. Follow him there and explore the ruin until you find Azani. He’s a powerful fighter, so be prepared. Fortunately, Modryn is essential, so he cannot be killed. Once he’s dead, take his ring off of his body and give it to Modryn, earning your promotion to Warder.