Elemental Imbuement

By imbuing a nonmagical melee weapon within range with a surge of elemental magic it gains power akin to a lesser primordial's core.

Choose one of the following damage types: Acid, Cold, Fire, Lightning, or Thunder.

For the duration, the weapon's damage type changes to type chosen, the wielder gains proficiency in it if they do not already, and it gains an additional 3d4 damage of that damage type. However, it can no longer be used during the attack action.

When you cast this spell and as a Magic Action on subsequent turns, the weilder can make a strike with the weapon, making a melee spell attack against a target up to 20 feet away as a slash of primordial energy releases from it. On a hit, the target takes damage equal the weapon's damage plus your spellcasting ability modifier and the next saving throw made against the spell "Elemental Bane" is made at disadvantage.

If you are concentrating or casting the spell "Elemental Bane" this spell no longer requires concentration as long as that spell stays active.