This Sub Class is based on the character Alistar from League of Legends.(Also this is more of a concept rather than a finished homebrew so the balancing may be off)

You are, or have, been imprisoned before and your body has been conditioned to the harsh conditions of restrainment.

Triumphant Strikes

Your unarmed strikes become supportive of your constitution granting shielding to yourself or an ally

Starting at 3rd Level When you make an unarmed strike expend 1 Ki Point to grant Temp Hp equal to half the damage dealt by the unarmed strike to yourself or an ally within 10ft

Headbutt

Your head-strong presence grants you the ability to fiercely strike an opponent with your head

Starting at 6th Level As a Bonus Action you can make 1 Unarmed Strike that has a doubled damage modifier and can send the target back 10ft in any direction

Forged Freedom

Your sense of untethered freedom allows you to bolster and support nearby allies

Starting at 11th Level you may expend 3 Ki Points to Heal all adjacent allies an amount equal to 2 of your Martial Arts Die any healing over their max health is granted as Temp Hp

Unbreakable Will

Any creature that has the arrogance to attempt forced movement against you will be put under your force pressure instead

Starting at 17th Level All Forced Movement against you or adjacent allies is instead redirected at the attacking creature