Just because everyone in the videos you've watched so far is using a Gjallarhorn doesn't mean it's required. Gjallarhorn isn't a strategy, it's just a weapon.
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	though you are right, take it from someone who fought Urrox. he has a heck of a lot of health, the Gjallarhorn is the hardest hitting weapon, and it still barely did damage. you dont need it, but it would most definately help
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	I agree, it's the best launcher by far, but this guy said it's the only way and to not even try without it, which is just silly talk.
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	I was running around with Hunger of Crota on that boss, and i was dealing so little damage, it was ridiculous