Body Treading

Starting at 17th level, you can spend 2 ki points to choose a target within 5 feet and share it's space (no action or checks required).

While you do, you can end your movement into the target's space and you follow it as if you were mounting it. Whenever you share a target's space in this way and an attack against you misses, you can choose to make it hit the target instead. Additionally, while sharing a creature's space in this way, you gain the following benefits:

Hindering Attacks. Every time you hit the target with an attack, it's movement speed is halved until the start of your next turn.

Protective Help. Using the help action on the target lets you help it dodge attacks. It benefits from the effects of a dodge action until the start of your next turn.

Proximity's Advantage You gain advantage on Grappling and Shoving contests against the target.

These effects last until you start your turn out of the target's space, until it loses physical form, or until you are forcefully moved out of the creature's space.