Elemental Punisher Longbow (spoiler request)

Does anyone know the location of this bow in the main campaign? Thank you!

If the fey merchant don’t have it, then its that you cannot get it outside the rogue-like dlc of Beneath the stolen land. The item was most likely created but never added to game. A few items are the same like:

Swamp Dweller’s Boots
Bracers of the Ruby Phoenix Champion

Yeah, the fey merchant doesn’t sell it. Thanks.