Collateral

You touch one creature and it is imbued with the cosmic power of collateral damage. If a creature under the effect of this spell takes the Attack action before your next turn, they may make a second attack with disadvantage against a target within 5ft of the original target or in line behind the original target and still in range of the original attack. Regardless of whether the second attack hits or misses, the target of this spell cannot have Collateral cast on them again for 1 minute.

At Higher Levels. The target of the spell gains one additional attack when you reach 5th level, 11th level, and 17th level.