Monks of the Way of the surging river are martial artists that focus on internal connection and movement above all else. They can unleash their internal strength after hitting unarmed strikes enough times, have wills that allow them to keep standing when others might fall, and can release their spiritual river to push back enemies.

Crushing Waves Fist Art

Starting when you choose this tradition at 3rd level, you learn how to harness the connection within your body to make your strikes ever more relentless, like the endless flow of a river. The force from your strikes builds up, until it explodes in a burst of power. After every 2 attacks that hit a creature, you burst with power on the next strike that hits that creature.This burst of power can be harnessed in one of the following effects 

• Erosion: The burst of power from your strike grinds away the creature’s armor reducing the creature’s AC by 1
• Waterfall Crashing: The burst of power from your strike bears down with the force of a waterfall, forcing the creature you hit with this attack to succeed in a STR saving throw or take bludgeoning damage equal to your martial arts die plus your wisdom modifier.The creature takes half damage on a successful saving throw.
• Endless Flow:  The burst of power from your strike  is harnessed by you to make another unarmed strike against the same creature.

Unyielding Will

At 6th level, your will has been tempered by the unending river you seek to emulate, allowing you to take nigh endless weathering like a rock. Once per long rest, when a attack would deplete your hit points to 0 or lower, you may instead survive at 1 hit point.

Spiritual river manifestation

Beginning at 11th level, your  ki becomes strong enough to manifest as a spiritual river.Once per long rest, or by expending 2 ki points you may manifest your ki , casting Gust of Wind. The saving throw for this spell is equal to your Ki Save DC (8+Wisdom modifier+proficiency bonus) 

Perfect flow

Starting at 17th level, you learn to put yourself in a state of perfect flow by spending 3 ki points at the start of your turn, every turn you wish to maintain this state. In this Perfect flow state, your body is in a state of perfect connection, allowing you to
Add your wisdom modifier to the damage of your unarmed strikes
Select 2 of the options from Crushing Waves fist art when you burst with power
Bursting with power only requires 1 unarmed strike to hit before you burst with power on your next unarmed strike