If you've been reading the books and such found in the same dungeon area, you'll learn about trapping a dead dragon in a dragon orb. Such an orb, if given to Klauth, will take away about 80% of his hps. This should make the fight much easier.
I did kill him with a solo monk, but after doing the dead dragon orb bit. It wasn't too bad of a fight. It helps if you have an item that absorbs some fire damage, like Chromatic armor or a ring of the Elements.
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