Spell Slash (5e Feat)
From D&D Wiki
Prerequisites: The ability to cast one spell of 1st level or higher
Arcane energy flows out of your fingertips whenever you cast a spell, and you can use that to imbue your attacks.
- After you cast a spell of 1st level or higher, you can add twice the spell level as additional damage to your next weapon attack within 1 minute, making the attack count as magical if it wasn't already. This does not stack with itself, and casting another spell will refresh the duration, only replacing the damage if the first spell was lower level.