Elementalize

You touch a weapon. Until the spell ends, that weapon now deals one of the following damage types (of your choosing): Acid, Fire, Cold, Lightning or Poison damage. The weapon uses the same amount of dice and keeps the same bonuses already applicable, however the damage is now one of the aforementioned types.

If the weapon uses multiple damage types, the primary damage dice is changed (for example: a sword deals 1d8 slashing and 1d4 fire damage, after Elementalize is cast upon the sword the 1d8 slashing damange is the dice that can be changed.)