Firkragg was a breeze. Just summon a couple of Dung Beetles and a pet Chinchilla and you’ve got it made.
Sorry, I’m in one of those moods today.
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This was a tough battle but the key for me, to reiterate what has already been said, was the lower resistance spell. This spell is cumulative so cast it at least twice if not more while he is tied up with summoned creatures. After that he becomes a lot easier to kill.
Good luck.