I dont have it myself yet. But based on the feedback ive seen from multiple content creators.
Mythoclast isnt the strongest option for anything atm (not that it'd stop me from using it).
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I have a idea for a buff that would give it a place in the game without being so good that its broken.
Give its base auto rifle style fire overload rounds. Then give the linear fusion shots anti barrier.
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Imo these two things would get it play time due to versatility without it being "too strong"
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honest I think bungie is bat shit afraid of having a D1 repeat, guess the gun was made for PVE, we dont really need an auto rifle that can turn into an arbalist