Honestly, at this point, it's ridiculous. Teams are using this overpowered gun to defeat bosses without actually playing though their mechanics.
And for those of you who think I'm a "casual scrub", check my stats.
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I think it's better to just find ways where people can't use Gjallarhorn that way. Such as the Crota fight where only one person can damage his actual health and it has to be with a special weapon. The issue is with basic game mechanics on the bosses. Not Gjallarhorn.