My thing here is, we did this with Blessing of Light before this try and failed because we got detained at the last second when he barely had a bee's dick of health left. This try we switched to Weapons and kicked his ass in 40'ish seconds. Weapons HAS to be giving bonus damage, somewhat, to the G'horn.
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I'm my opinion it's much better to use blessings. Everyone jumps straight up and fires a rocket. You can fire more rockets because you never have to worry about regaining your health. More rockets are better than waiting a couple seconds for your health to come back.