This was the last mission I had for warrior campaign, after this was a easy scenario, and finally third relic slot, YAY!
Quick note, this mission requires Arms, Whirlwind, and Heroic Leap abilities as well as Hymdall. He doesn't need to be 108 though. Mine was 105 and success rate was still 118% As long as your other 2 are high enough and counter the 3 enemies, you're safe.
I had Thorim and Ragnvald at 110 on this mission and them 2 alone countered everything and put the mission success rate over 100%, my 105 Hymdall was just there for the ride.
Requires Hymdall follower to be in the mission.
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Legion Class Hall Mission Guide