Everyone complains about this part, but it's honestly one of the easiest. As long as you know what you're doing it should only take five tries max. Oddly enough they couldn't get Calus done when I think he is rather easy as well. Hardest part of the raid is navigating the tunnels to find the chest.
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This map made all the difference. I took my group who struggles for 2 hours and got thru it in like 4 tries. Once you know the paths its SO simple.