Dragon's Edge

You weild a weapon and imbue it with the elemental power of a dragon. Choose one of the following damage types: acid, cold, fire, lightning, poison, or thunder. The next time the weapon hits a target before the spell ends, it deals an extra 2d12 damage to the chosen type.

Upon casting the spell, make a DC 18 Intelligence Saving Throw. On a failed save, you cannot recast till the next Long Rest.

At Higher Levels: When you cast this spell using a spell slot of 4rd level or higher, the extra damage increases by 1d12 for each slot level above 3nd.