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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In the original breakdown of the class they way they said quiver worked was a tether arrow for the first shot then two explosive arrows that don't tether