Not vanilla, it’s a mod

@@JacobPhillips-dt6ry I'm honestly not sure what mod pack it was from, but the name of the bow is "Aetherial RII Bow". I got it as a drop from a NPC, they were carrying a slew of Aetherial weapons not vanilla to the game. If I had to guess it would be from either the Extended Encounters mod by Jonx0r, or the Adventurers and travelers mod by vlaka.