The Blademaster

A skillful offense may bring awe to a crowd, but it is a flawless defense which will keep you alive, or so a Blademaster would have you believe. These skilled swordsmen are patient warriors, preferring to dodge and counterattack their foes, rather than rush them down.

Features

Hissatsu: Chiten

Beginning at 3rd level, when a creature makes a melee weapon attack against you, you may use your reaction to make an attack of opportunity against the creature.
 

Nothing Ventured

At 6th level, your defensive fighting style and cool head have helped you learn how to best discern the location of traps. You have advantage while making Wisdom (perception) and Intelligence (Investigation) checks while looking for traps and hidden passages.
 

Mind's Eye

At 10th level, when a creature makes a melee weapon attack against you, as a reaction you may spend a number of sen charges to increase your armor class by 1 for each charge spent. You must declare you are doing this before the die result is decided.
 

The Worm Turns

At the 14th level, you may take two reactions in each round of combat. Additionally, while you are under the effect of Third Eye, non magical weapon damage you take is reduced by a number equal to your Wisdom ability modifier and creatures you hit with an Attack of Opportunity have their remaining movement reduced by 10ft.