The archetypal wind knight can strike with the swirling wind created by their weapons. They use air pressure to transform melee strikes into projectiles, and spin their ranged volleys so that they hit with cyclone force. Wind knight abilities are not magical. They follow an ancient fighting tradition focused on the flow of air, sound, and pressure, handed down through generations of masters and devoted pupils. These warriors constantly seek to improve and refine their skill, searching for worthy opponents to both test and hone their abilities against.

Wind Strike Technique

When you choose this archetype at 3rd level, you gain the ability to strike using a weapon with such precision and skill that you can harness the air to your advantage.

You have four wind strike dice, which are d8s. You can decide to use a wind strike die that isn't expended before you make a weapon attack on your turn if you aren't in a liquid or vacuum. This augments the attack, giving it certain benefits depending on whether it is a melee or ranged attack:

For a melee attack, the reach of the attack is increased by 10 feet, and if the attack is made outside the weapon's normal reach, it counts as both a melee weapon attack and a ranged spell attack and it treats liquids and vacuums as if they were total cover. For a ranged attack, the attack ignores disadvantage caused by long-range or the effects of wind, and the weapon returns to one of your free hands at the end of your turn if it has the thrown property.

If the attack hits or deals any damage, you roll the wind strike die and add the result to the damage for the attack, and the wind strike die is expended. You regain all of your expended wind strike dice when you finish a short or long rest. You gain another wind strike die at 7th level and one more at 15th level.

The bonus to the attack's reach is increased by 5 feet at 7th, 10th, and 15th level.

Bonus Proficiency

At 3rd level, your study of air, wind, and sound grants you new insights and draws out your talents. You gain proficiency with one musical instrument of your choice. Alternatively, you learn one language of your choice.

Bonus Language

You learn one language of your choice.

Musical Instrument Proficiency

You gain proficiency with one musical instrument of your choice. 

Adept Hearing

At 7th level, your awareness of the air currents flowing around you sharpens your hearing to exceptional levels, allowing you to hear things as quiet as the rustle of wind through an illusion or the heightened pulse of a liar. You have advantage on Wisdom (Perception) checks and Intelligence (Investigation) checks that rely on hearing, and on Wisdom (Insight) checks to detect lies if the speaker is within 30 feet of you and you aren't deafened.

Wave Bender

Starting at 7th level, your Wind Strike feature no longer treats liquids as total cover and isn't limited by liquids, and when you augment an attack using a wind strike die, it doesn't suffer disadvantage for being underwater.

Also, you gain the ability to bend the arcs of your projectile attacks. When you augment a ranged attack using a wind strike die, the attack ignores up to 1 of the bonus to AC provided to the target by cover.

When you reach 10th level, this number increases to 2, and it increases again to 3 at 15th level.

Improved Wind Strike

At 10th level, your wind strike dice turn into d10s. At 18th level, they turn into d12s.

Cyclone Strike

Starting at 15th level, when you roll initiative and have no wind strike dice remaining, you regain 1 wind strike die.

Wind Strike Master

At 18th level, your mastery over wind-based attacks becomes absolute. When you make a melee weapon attack on your turn and don't augment it using a wind strike die, the reach is still increased by 10 feet. When you make a ranged weapon attack on your turn, you always ignore disadvantage caused by long-range, being underwater, or the effects of wind, and the weapon returns to one of your free hands at the end of your turn if it has the thrown property.

Finally, your skill becomes so legendary that your Wind Strike feature ignores vacuums.