Weapon Arcanery

You can channel magical energy into one simple or martial weapon you’re holding, and choose one damage type: thunder, acid, cold, fire, lightning, or poison. For the duration of the spell, you deal an extra 1d6 damage of the chosen type to any target you hit with the weapon. The weapon is considered magical for the spell's duration, if it was not magical already.
As a bonus action, you can change the damage type, from the options above.

Cast At 3rd Level or Higher:
You can maintain your concentration on the spell for up to 8 hours.