Well you don't "need" the gally to complete every part of the game it's just that much easier with it. It would be like paying for an easy mode is what I foresee.
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In your opinion what is a good alternative to the gjally? I have an icebreaker and dragons breath are they adequate?
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Depends on the situation. Nothing besides gally is going to let you walk in and kill a PoE boss in 25 seconds but it's not impossible without a gally. IB is a awesome gun and great for all situations, DB wouldn't be my first choice in a Crota fight though, even if that was the only exotic I had lol, but I have used it on him with no problems.