Water Breathing is taught by Sakonji Urokodaki. He is located in a small hut, on the right path. between Minobu Village and Rice Field bridge.
<Level 15> First Form: Water Surface Slash (E)
The Player dashes and swiftly slashes the enemy.
<Level 35> Second Form: Water Wheel (R)
The Player brings up the player up and slashes the enemy like a windmill.
<Level 70> Third Form: Flowing Dance (T)
The Player Dashes swiftly with a watercourse on the Sword and slashes the enemy by dancing. It auto hits random player near the user.
<Level 170> Fourth Form: Striking Tide (Y)
It jumps and swiftly slashes the enemy in one shot with the watercourse on the Sword.
<Level 300> Fifth Form: Constant Flux
User jumps back in the air and slashes the enemy with a water dragon
Quest to achieve:
<Level 15> 1st Quest: Break the Training Rock
<Level 35> 2nd Quest: Defeat Urokodaki
<Level 70> 3rd Quest: Defeat 11 Water Breathing Students
<Level 170> 4th Quest: Defeat Tanjiro Kamado
Combo:
Skill 1/Skill 3, M1, M1, M1, Skill 2
Rinse and repeat.