Arcane Weapon (UA)

Source: Unearthed Arcana 60 - The Artificer Returns, DND 5e Wiki

1st-level transmutation

Casting Time: 1 bonus action

Range: Self

Components: V, S

Duration: Concentration, up to 1 hour

You channel arcane energy into one simple or martial weapon you’re holding, and choose one damage type: acid, cold, fire, lightning, poison, or thunder. Until the spell ends, you deal an extra 1d6 damage of the chosen type to any target you hit with the weapon. If the weapon isn’t magical, it becomes a magic weapon for the spell’s duration.

As a bonus action, you can change the damage type, choosing from the options above.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can maintain your concentration on the spell for up to 8 hours.

Spell Lists: Artificer