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Wish-Ender has some pretty interesting perks, most notably that you can see through walls when you draw an arrow and can penetrate multiple enemies. It can also be used to destroy Taken Crystals (eggs). Destroying these will give you Reverie Dawn armor pieces guaranteed.
The bow ties in with The Shattered Throne, which you must complete first - already included in the price.
The initial price includes the full Wish-Ender Bow Questline