im not saying gjallarhorn is bad by any means. it's definately a tier one weapon but judging by how the community talks about it you would think its a one hit on all 26 strike bosses. in reality i prefer having an icebreaker or even my red death instead of having my exotic slot being used on a heavy with a max for me of 7 shots.
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It's great for raids. And solar burn night falls. 2-gjallarhorns < 3 icebreakers