Diamond Mind Style

Warriors trained in the Diamond Mind are contemplative, graceful, and startlingly quick. Select one of the following weapons: longsword, rapier, spear, or trident. You gain proficiency with the weapon, if not already proficient.

You gain 2 ki points. You regain your ki points when you finish a short or long rest.

You learn one Diamond Mind maneuver of your choice, which you can perform with your selected weapon. If a maneuver you use requires your target to make a saving throw to resist the maneuver's effects, the saving throw DC equals 8 + your proficiency bonus + your Strength or Dexterity modifier (appropriate to your selected weapon).

Action Before Thought. You add your Wisdom modifier to your initiative rolls.

Hearing the Air. You may spend 1 ki point to gain blindsense out to 30 feet. This ability lasts for 10 minutes.

Insightful Strike. Prerequisite: 7th level. When you make an attack, you may spend 1 ki point to add your Wisdom modifier to your attack roll. Your attack deals psychic damage. 

Nightmare Blade. Prerequisite: 10th level. When you hit a creature with an attack, you may spend 2 ki points and deal psychic damage equal to your Wisdom modifier. That creature has disadvantage on Wisdom saving throws until the start of your next turn.

Time Stands Still. Prerequisite: 15th level. Once per round on your turn, you can spend 3 ki points and take an additional Attack action.