Way of Forbidden Knowledge

In their isolated monasteries, some monks come across lost tomes or spiritual revelations which unlock unfathomable secrets of the universe.  This forbidden knowledge alters the psyche of any mortal who even begins to contemplate it.  Evil monks that discover forbidden knowledge often leave their monastery to seek out further eldritch wisdom to increase their own power.  Good monks that discover forbidden knowledge often leave their monastery to find and safeguard or destroy sources of this knowledge that mortals should not possess.  Neutral monks that discover forbidden knowledge often leave their monastery to discover lost secrets of the universe and transcend their consciousness beyond mortality.

Mind Assault

Starting when you choose this tradition at 3rd level, you gain the ability to assault an enemy's mind with unfathomable secrets. 

As an action, you can spend 1 ki point to force a target within 30 feet to make an Intelligence saving throw.  The DC of this save equals your Ki save DC plus your Intelligence modifier. On a failed save, the target takes psychic damage equal to 2d6 plus your Wisdom modifier, and the target has disadvantage on its next attack until your next turn.  On a successful save, the target takes half damage and does not have the disadvantage. 

After you use this ability, for the rest of the turn, your unarmed strikes have a range of 30 feet and deal psychic damage.

Eldritch Secrets

When you choose this subclass at level 3, your understanding of occult truths grants you proficiency in the following skills: Arcana, Nature, Religion.

You can spend 1 ki point to reroll any Intelligence roll that you make.  You must use this ability after you see the result of the roll, but before the DM tells you the result.  A roll can only be rerolled once with this ability.

Esoteric Techniques

At 6th level, your ki abilities become more difficult to defend against.  Add your Intelligence modifier to your Ki save DC.  In addition, whenever you successfully stun a target with your Stunning Strike, the target takes psychic damage equal to your Monk level.

Whispers from Beyond

Beginning at 11th level, you can channel whispers from the Far Realm.  As a bonus action, you can spend 1 ki point to cast Silence centered on yourself.  The spell lasts 1 minute and you do not have to maintain concentration to maintain the spell.

Unveiled Sight

At 17th level, your knowledge of forbidden truths allows you to peer beyond your physical surroundings.  You can spend 2 ki points to cast Legend Lore,Scrying,Contact Other Plane, orTrue Seeing by spending 10 minutes in meditation.

In addition, you are immune to the Frightened condition and you have advantage on saving throws against effects of Illusion magic.