An Elder Elven God named Shevarash bestowed his power on elves that mastered the art of archery.
This power was in the form of his essence and secret potions that enhanced the power of bows. Over time, as the Elves lost their way, these recipes and essenses were forgotten and abandoned. Today they are rarely found, but sometimes appear in old treasure chests.
Recipes and vials of the essence of shevarash can be found in loot chests, although can be very rare.
Alchemists can take the recipe and 5 vials and create a potion, but the fail rate is extremely high for items that are this hard to come by.
This potion is then poured over an elven craftables pure element bow, creating an extremely powerful new weapon that is permanently bound with the user.