Coup de Grâce

You’ve developed a skill for delivering a death blow, either as a mercy killing or a merciless execution.

In place of an attack on your turn, you may use a melee weapon attack to deliver a Coup de grace attack to a unconscious or paralyzed creature (CR of 3 or less) within 5 feet of you. To do this, the creature' s challenge rating can be no greater then 1/4 your level rounded to the next lowest cr.

Roll 1d20+level if you roll bellow a 12 you fail and alert nearby enemies.
The attack does 3x critical damage on a hit.

While delivering a Coup de grace, you provoke attacks of opportunity from creatures within a range of 5 feet of you. When you deliver a Coup de grace, your speed is reduced to 0  until the start of your next turn.