One of the insectoid styles of monk disciplines, the Way of the Mantis is an incredibly powerful technique, using Ki to enhance unarmed strikes by replicating a mantis’ serrated arms as well as practicing their behaviours of ambushing their targets. 

Stabbing Grasp

At 3rd level, you have learnt how to channel your Ki to replicate the powerful, serrated grip of a mantis.

Once per turn when you take the Attack action, you may forgo one of your attacks to attempt a Stabbing Grasp. If you do so, make an unarmed strike as usual but with a reach of 10 feet. On a hit, the target takes damage as normal + 2 extra martial arts die of piercing damage and must succeed on a strength saving throw against your Ki save DC or be pulled within 5 feet of you provided it a medium creature or smaller. As part of the same attack, if the target is now within 5 feet of you, you may spend 2 Ki points to cause the target to become restrained. While the target is restrained in this way, you can continue to make attacks against them as normal, however your movement speed is halved as the target is dragged along with you and attacks against creatures other than the restrained target have disadvantage. If you spend an additional 2 Ki points, you may pull a large creature with this attack but your speed becomes 0 while it is restrained by you.

You can end this restraint at any time, no action required, and the target can break free by making subsequent strength saving throws against your Ki save DC as an action on its turn, ending the effect on a success.

The damage and range of your Stabbing Grasp increases as you reach certain levels in this class: 3 extra martial arts dice at 6th level, 15 foot range and 4 extra martial arts dice at 11th level, and 5 extra martial arts dice at 17th level.

Ambush Predator

At 6th level, you have learned to emulate a mantis’ ambush strategy to hunt prey.

You have advantage on stealth checks. Additionally, when you hit a creature with a weapon attack or unarmed strike within the first round of combat, you deal additional damage equal to 2 martial arts dice if the creature has not yet had their turn.

This extra damage increases as you reach certain levels in this class: 3 martial arts dice at 11th level, and 4 dice at 17th level.

Eyes For Prey

A mantis hunts mainly by vision, and so by 11th level you have learned to hone your perception to seek your prey.

A creature being invisible does not impose disadvantage on your attack rolls, nor do their attack rolls have advantage against you.
Additionally, you have advantage on Wisdom (Perception) checks.

You must be able to see to gain these benefits.

 

Vice Grip

At 17th level you have mastered your Stabbing Grasp, becoming more mobile with it and making it almost impossible to escape.

You can move at full speed while having a medium or smaller creature restrained, and you can move at half speed while having a large creature restrained.

Furthermore, when a creature makes a Strength Saving Throw to escape your Stabbing Grasp, you can use your reaction to impose disadvantage on the roll. You can perform this reaction a number of times equal to your wisdom modifier and regain all expended uses on a long rest.