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Deflect Magic Missles

Your ability to deflect ranged attacks also applies to spells that require an attack role, reducing the damage of a spell to zero, to deflect a leveled spell you must expend ki equal to the spells level rather than needing to reduce the damage to zero, cantrips require no ki to deflect. 

Spell Theif

When you make an attack on a spell caster that is concentrating on a spell that causes them to lose concentration on that spell you can gain control of that spell. You must expend ki points equal to the level that that spell was cast at and all rules of concentration apply to you.

Mages Bane

You have advantage on all spell saving throws. Additionally as a reaction you may grant an ally that you can see in range advantage and proficiency on a spell save. You may use this feature a number of times equal to Wisdom modifier, expended slots reset on a long rest.

Spell Syphon

You have gained the ability to convert spell energy to ki, if you stop the damage of a spell with the deflect magic missles feature, rather than deflecting the energy you may choose to syphon it regaining ki points equal to the spells level. cantrips cannot grant any ki, additionally when you you cause a caster to lose concentration on a spell you may choose to syphon the energy of that spell as well granting a number of ki points equal to the spells level. This cannot make your ki exceed the max amount.

Spell Sentinel

Your reaction to a caster casting spells is so fast that you can prevent them from even getting their spell off in the first place, when you make an attack on a caster as a reaction due to the mage slayer feat you may choose to prevent them from casting that spell. Additionally you may use the feature to stop spells that have an instantaneous cast time such as misty step.

Mage Slayer

You gain the Mage slayer feat