Jotun is a Grizzleheim enemy. In any case, posts here can take up to a day to appear, so asking for live help won't do much good. You're going to need to ask high-level friends for help. An alternate idea is to go to the approved fansite Wizard101 Central and ask for help there.
If you haven't won yet, complete the two dungeons on either side of Jotun's Hall of Valor. Make sure you defeat the FINAL boss at the end of the side dungeons, and you'll be in for a bit of a surprise when you go back to challenge Jotun. *Spoiler Alert* In Hall of Valor, Jotun (I think) says something about the player being foolish to challenge "us." THat is him summoning his brothers, the two bosses who help him. By completing both side dungeons, you will defeat both brothers (one at the end of each one) and they will never assist Jotun again, so all future runs through Hall of Valor will yield only Jotun and a single minion at the end.
If you haven't won yet, complete the two dungeons on either side of Jotun's Hall of Valor. Make sure you defeat the FINAL boss at the end of the side dungeons, and you'll be in for a bit of a surprise when you go back to challenge Jotun. *Spoiler Alert* In Hall of Valor, Jotun (I think) says something about the player being foolish to challenge "us." THat is him summoning his brothers, the two bosses who help him. By completing both side dungeons, you will defeat both brothers (one at the end of each one) and they will never assist Jotun again, so all future runs through Hall of Valor will yield only Jotun and a single minion at the end.