Dusk Bow is a bow found in Tears of the Kingdom.
Tears of the Kingdom
"A bow that's been in the royal family for ages. Said to have been used by a princess who fought beasts of twilight. It forcefully fires long-range arrows."
The Dusk Bow is found inside of an alcove broken into the tallest central steeple of Hyrule Castle directly above the Sanctum. Unlike other legacy weapons, it is not contained in a Treasure Chest but is instead laying in the open, visible from a distance, and so eventually respawns. It has a power of 30, durability of 40, and range of 40 - twice the range of standard bows - but cannot get a weapon bonus, either when found or from a Rock Octorok.
One of the handful of special legacy Zelda weapons that can be both found in-game and through scanning amiibo, its design is modelled after the Twilight Bow from The Legend of Zelda: Twilight Princess and uses the model of the amiibo-only bow of the same name from The Legend of Zelda: Breath of the Wild. Unlike the bows it is modelled after, however, it fires conventional arrows rather than Light Arrows. As it can be found in the overworld unlike the Twilight Bow, the Dusk Bow has a compendium entry, listed at #455.
The Dusk Bow can also be acquired by scanning the Zelda (Twilight Princess) amiibo in either the Zelda or Super Smash Bros. iteration.
Tears of the Kingdom Hyrule Compendium default picture of a Dusk Bow