Are you a sent or guard? If you're a guard you might want to try bringing along C2 and just tanking him.
But really the best way (either AC) is to just use Kira, buff yourself the best you can, and out DPS him.
Stop his Ravage at all costs. It's the only skill of his you really need to worry about, and as long as you interrupt it immediately, you should be okay. His AOE thing you can just eat. It hurts a bit, but wasting your interrupt on that and have him follow up with a ravage is bad news.
I beat him with my sent at 26, so it's totally possible.
Also (and I don't want to spoil too much for you), if you're light side, pay close attention to your convo options. There are two LS options, one of them sends him back to Tython. If you do that one, it will pay off later.