You use monk powers to shield damage and protect others

Defensive stance

You can now use dodge as a bonus action and you may use your shields as an addition to your armor class

Shield proficiency

Due to your monk ways, you can now use shields as weapons dealing the equivalent of your unarmed strike with the defense of your shield as well as being able to incorporate it into your flurry of blows

Frosty mind

You may now use deflect missiles twice as a reaction

Shielding strike

As a reaction you may make 1 attacK at an enemy within five feet while negating any damage you would take from them

Shield the helpless

Once per combat you can spend you may spend 5 ki points to jump in front and protect another creature and negating all the damage from that attack

Defensive field

You use your expertise to protect others and help your allies in battle. At 17th level, you may spend ki points to give armor to your party for 1 minute, you may spend 3 ki points per armor class up to 3 armor classes for your party.