Elemental Weapon

You imbue a weapon with elemental energy.
Choose a damage type: air, bolt, earth, fire, or ice.
Until this spell ends, all damage dealt by the weapon
becomes of the chosen damage type. If you have that
weapon equipped while you cast this spell, you may
perform a free attack with it as part of the same action.
This spell can only be cast on a weapon equipped
by a willing creature.