I beat it YEAAAAAAAAAAAAAAA
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It Took Me Many Attempts to Beat Phase 1 Phase 2 Was Easy and Phase 3 Was simple There Is a Secret Way to Beat Phase 3 You Have to Stay in the Elevator for the Whole Phase and Wait for the Cooldown to Be Done So You Can Shoot a Bsoda at Him and Then Wait Again for The Cooldown to Be Done and Then Over and Over Again Until His Health Is Down To 0.