This used to be a big post, but I'll just cut to the chase.
I think that Quiver should work like how the Taken Hobgoblins Orb projectiles work.
Shoot 3 arrows from 1 bow like an unrealistic archer badass.
Would make the experience of using the super consistent no matter what perk.
Could possibly be compared to shatter for Nova Bomb.
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It wouldn't kill a sunbreaker in that instance seeing as you need 1 to drain his super and another direct shot after