Way of the Mantis

Monks devoted to the Way of The Mantis excel in exploiting openings and finding weakpoints, 

Level 3: Twitch

You are able to push past your limits, using ki points to reduce the cost of actions, and use more reactions.

Action > Bonus Action: 1 ki point

Bonus Action > Reaction: 1 ki point 

Extra reaction: 2 ki points

Level 6: Claws of the Mantis

Flurry of blows can be done with a weapon. Doing so imposes disadvantage on the attacks.

Level 11: Mantis's Camouflage

You gain proficiency and advantage in stealth checks, as well as the ability to make sneak attacks. If you are already proficient in stealth, you gain mastery instead.

Level 17: Mantis's Ambush

You have mastered the art of exploiting openings. You are able to make opportunity attacks whenever a target moves into melee range, as well as when an enemy misses a melee attack against you. You can make one opportunity attack as a free action once per turn.