Tough fight. At 46 he conned orange to my reaver. He casts dots, debuffs, and lifetap DD's, and apparently can't be unterrupted. I had to use IP to kill him, and even then I died from his DOT.
Be VERY careful of the aggro near his tower. They aggro from very long distance. I pulled him from his tower to the clear area south, which has the advantage of avoiding the aforementioned aggro, but the drawback of allowing him to cast a few times on his way to you.