Just played it a few times today and it really needs to be fixed. I tried to use a banner and I couldn’t and with the effect of prism as the modifier it becomes impossible for anybody to beat. Not to mention that the yellow bars are throwing darkness bombs at every few seconds so you can’t go near them. Not to mention the vex hydras shield moves way to fast around it.
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It seems you don't understand prism. It's an amazing modifier that helps you.