Legitimately one of the worst experiences playing this game I've ever had. Impossible to get close enough to trigger the anti-immunity at his last stage with his constant railgun. And then I got frustrated and went to orbit, only to discover I have to do the whole mission again.
Getting a lightsaber isn't worth it. Time for Destiny to collect dust again.
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And I'll note that I loved the level design up until that point. The cinematic flip was incredibly cool! But all of that was wiped away by how needlessly frustrating the final boss is.