During the journey, the Witch of the Woods gives the bow a magical string that can be imbued with the light of Alfheim to imbue its arrows with said light, which becomes useful in activating the Elves' light crystals to create solid light bridges. Much later, Sindri uses a tooth of the recently slain Hrzlyr to imbue the string with the Dragon's lightning power, which can also imbue its arrows with lightning to destroy blocking walls of crystallized World Tree sap. Atreus seems to enchant his arrows with spoken incantations that vary depending of the element he's using.