Eamon's Riddle of Steel

You Infuse a basic weapon with raw, Arcane essence, granting it magical bonuses on top of what it may already have. As a bonus action, you give the weapon used a bonus to hit equal to your INT modifier. it also becomes a magical weapon for the sake of overcoming damage resistances and immunities, and deals a different damage type with each attack, which is determined by a D4;

On a 1, the weapon deals fire damage, on a 2 it deals cold damage, on a 3 it deals lightning damage, and on a 4, it deals force damage.

In addition to the change in damage type, the Weapon deals 2D6 extra damage of the type rolled during the attack.  

If you drop the weapon or throw it, it returns to your hand at the end of your turn.

At Higher Levels. When you cast this spell using a 3rd level spell slot or higher, the bonus damage increases by 1d6 per spell slot level