Deep Magic Volume 2 (p.175)
Elemental Infusion
1-level Transmutation
Casting Time: 1 bonus action
Range/Area: 10ft.
Components: Verbal, Somatic
Duration: Concentration, 1 hour
Damage/Effect: Buff
You infuse an ally’s weapon with the power of the elements. Choose a weapon worn or carried by a friendly creature within range and choose one of the following damage types: acid, cold, fire, lightning, poison, or thunder. Until the spell ends, that weapon’s damage type changes from its normal type to the chosen type. The spell ends early if the weapon is held by a hostile creature at the start of your turn or if the weapon is not in the possession of a friendly creature for more than 1 minute.
At higher levels: When you cast this spell using a spell slot of 2nd level or higher, you can target one additional weapon for each slot level above 1st. All affected weapons are changed to the same damage type.
Available for: Druid, Ranger, Sorcerer, Wizard