The new Fuse Ability in Tears of the Kingdom allows Link to combine just about anything to shields or swords to increase their attack power and durability. While players can fuse objects to arrows, they can't increase a bow's durability the same way they can sword/shields. Fortunately, the bows that Link will pick up from enemies or loot from chests aren't decayed from the gloom. This applies to the Swallow Bow, a weapon exclusive to the Hebra region.