I did it on hard just to have an easier time getting to Deathbringer, but I think some people suggest very hard just to make Deathbringer's attack pattern more exploitable? In the video he seems to use the charge attack right after he gets back up, and that may be because the person is backing up as soon as possible. In my experience (playing on hard), Deathbringer didn't spam that attack as much as in the video, but still quite a lot if you spaced yourself far away from him.
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