Adrenaline Rush

You briefly fill one creature you can see within range with surging energy. Until the start of your next turn, the target's Speed is doubled, and each time it hits with an attack roll and deals damage, it can add 2d6 to the damage roll.

Using a Higher-Level Spell Slot. The extra damage the target deals on a hit increases by 1d6 per every 2 levels of spell slot above 2.