I think I just force waved my way through that part.
Rock hard to me is a boss fight that can last upwards of 5 hours
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I mean if you don't know what you're doing, I did, but it took my sister five hours to get through Trayus, she hadn't gotten force-wave and without that its a pain to get through, not impossible but defiantly a pain <_<
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It took me about 10 minutes to melee my way through to Sion. Less time if I have the third Force Lightning power.