Need help to defeat Zarpedon!

If you can help me I would love it. It appears that my game says i am supposed to be like 6 levels above what I am. So it is really hard to defeat lvl25 Zarpedon and I was wondering if any one would like to help me on the main quest. If you help I will gladly give the loot dropped from the boss to you. So if your interested please message me on a XBOX One.(Gamer-tag is AverageSundew63)