I don't know how people found King Allant hard. Keep your distance (especially when he starts yelling), and roll into him when he charges forward (he'll miss), then swing once or twice depending on your weapon speed and burden, then gtfo of the way.
Perhaps a lot of it had to do with my build though. I prioritized naked running speed over everything else as it allowed me to roll all over the god damn place and still be able to run.
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