Prerequisites: None
When you hit a creature with a melee weapon attack, you can expend a Maneuver Die to strike with supernatural accuracy at its most vulnerable point.
It must succeed on a Constitution saving throw or it is considered vulnerable to the damage of this attack. If you had advantage on your attack roll, it makes this Constitution save with disadvantage.
Regardless if the creature succeeds or fails on this saving throw, it takes bonus damage equal to four times your Maneuver Die. If this attack reduces the target to 50 hit points or fewer, it falls Prone and is Stunned until the start of its next turn.
A creature can expend a Legendary Resistance to avoid this effect.