Disclaimer: This subclass is intended for modern campaign settings.

Baseball

Hey, Batta Batta

Starting at 3rd level, you can use greatclubs as monk weapons, and a greatclub only uses one of your hands while you are not currently attacking with it.

Knuckleball

Starting at 3rd level, when you make an unarmed attack and have at least one free hand, you can spend 1 ki point to instead make this attack as a projectile attack with a normal range of 60 feet and a long range of 120 feet. This attack counts as an unarmed strike, but not as a melee attack.

Swing, Batta Batta

If your are currently wielding a greatclub, you can use your Deflect Missiles feature on any projectile passing within 10 feet of you whether or not it is targeting you. If you reduce the damage of  projectile to 0, you can also make an attack with it without spending a ki point.

That's a Catch!

Starting at 11th level, If you catch a projectile with your Deflect Missiles feature, you can spend 4 ki points to stun the creature that threw or shot the missile until the end of your next turn if they are within 60 feet of you. If you use this feature, you can't also make a ranged attack with the same missile.

Home Run!

At 17th level, your greatclub attacks score a critical hit on a roll of 19 or 20.

Additionally, when you score a critical hit with a greatclub attack against a target of a size Large or smaller, the target must make a Strength save. On a failure, you may choose to launch the target to any point within 15 feet for Large targets, 30 feet for Medium targets, 60 feet for Small targets, or 120 feet for Tiny targets. Any creature within the target's new space must make a Dexterity save or take an amount of bludgeoning damage dependent on the creature's size (1d4 for Tiny, 1d8 for Small, 1d12 for Medium, or 2d10 for Large) or half as much damage on a success. Regardless of save results, affected creatures are pushed to the nearest available space.

Regardless of the results of your critical, your movement speed also doubles until the end of that turn.