Prerequisite: Level 8 and Extra Attack.

You cleave through foes that are packed together.

Once Per Turn - Melee - 1 Creature - Uses Equal to Proficiency Bonus/Long Rest

You replace one weapon attack with a cleaving attack. You swing, targeting one creature and all creatures of your choice within 5 ft. of the first target. You are still limited by your weapon's normal reach. You roll a single synchronous attack roll for all targets, dealing the same damage to each. 

Cleave counts as an area of effect ability for the purposes of attacking swarms, and if targeting a creature with Mirror Image active, you target all images and the caster.