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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Tried it yesterday with only 2 GHorns, we had him down to probably 1% health then we died and couldn't kill him the rounds after for some strange reasons. I hate him! ;) If someone with a Gjallarhorn is willing to help me out in about 3,5 hours just hit me up on xbl.