Bow of the Bound Elementals

Weapon(longbow), Legacy, requires attunement by a creature without any levels in the wizard, warlock or sorcerer classes. Years ago a powerful mage managed to trap four elementals inside a longbow. His goal was to forge a powerful weapon to be used by his favored general. He believed he would create a weapon with great elemental power but could not compel the bow to offer up any more power than a well made bow. Believing he had failed, he gave the bow to his general nonetheless, citing its superb craftsmanship. Over the next few months the general seemed more and more uneasy every time he was around the wizard. After a particularly fierce battle, the general shot an arrow toward the mage. Upon impact a fiery form leapt out from the arrow and consumed the wizard in an infernal blaze. The general was quickly arrested and thrown in jail. He screamed every night until his execution. "I had to do it. It was right. It was revenge. They wouldn't stop until I put him down." Turns out, elementals hold grudges. This is that bow. This bow is made from a dull black metal that doesn't feel like it should bend as well as it does. The front of the bow has four sockets with four runes representing the elements around each socket.

Elemental's hidden power This bow houses four elementals with a seething hatred for mages. They will not allow themselves to be used by another spellcaster. As such, if the bow is the target of an Identify spell this bow is shown as a +1 longbow with a +1d6 fire dmg on a crit. The bow will not attune to a spellcaster and holds much more power than shown. This power is made available to the wielder as the elementals see fit. As the wielder grows more powerful they can work with the elementals to set loose more power from the bow.