Monks of the way of the spirit focus on being in tune the spirit world. They can call upon spirits to aid them, and they can temporarily separate their own spirit from themselves.

Release Spirit

Starting at 3rd level, you can spend 1 ki to release your spirit from your physical body as a bonus action, it appears within 5ft of you and lasts for 1 hour. Your spiritual self is incorporeal, it can move through solid objects as if it were difficult terrain and is resistant to all damage (except psychic). It moves silently and has advantage on stealth checks to pass unnoticed but it must remain within 300 ft of your physical body. 

Your spiritual self has the same movement speed, hit points, and features/abilities as yourself but cannot lift/carry/push objects weighing more than 10 lbs. It does not benefit from any equipment you are wearing. Your spirit can make unarmed strikes, benefiting from your Martial Arts, it uses your Wisdom modifier for attack and damage rolls. If your spirit is reduced to zero hit points it vanishes and your physical body falls unconscious, at 0 hit points but stabilised. 

While your spirit is separated from your body, you are blind, deaf, and incapacitated. You instead see and hear through your spiritual self. If your physical body suffers damage your spiritual self is instantly returned to your body. When your spirit returns to you, you suffer all accumulated damage it has endured.

Call Upon Spirits

At 6th level, you gain the ability to call upon spirits to aid you. Choose three different requests you learn to make. You learn one additional request at 11th, and 17th level. Spells granted by these requests using Wisdom as your spellcasting ability modifier, and do not require material components unless stated otherwise.

Request Aid

You ask spirits to help you or one of your companions. As a reaction, you spend 1 ki point to grant a bonus equal to your Martial Arts die to one ability check or saving throw made by a creature you can see within 60 ft of you. You can choose to use this ability after the check or save is rolled but before the DM has announced if it is a success or failure.

Request Banishment

(requires 11th level character)

You call upon spirits to banish one of your enemies. You can spend 6 ki points to cast Banishment.

Request Barrier

(requires 11th level character)

You ask spirits to make a barrier. You can spend 6 ki points to cast Wall of Force.

Request Distractions

You ask spirits to help distract or fool your enemy. You can spend 2 ki points to cast Mirror Image on one willing creature within 30 feet of you.

Request Emprisonment

You call upon spirits to restrain a creature. You can spend 2 ki points to cast Hold Person, for every 2 additional ki points spent you may target one additional target with the spell.

Request Extra Hands

(requires 11th level character)

You ask spirits to help carry/move objects for you. You can spend 6 ki points to cast Telekinesis.

Request Information

(Requires 11th level character)

You call upon spirits to provide you with information. You spend 1 hour meditating to cast one of the following spells (you must provide material components)

• Divination
• Commune
• Legend Lore
• Scrying

Request Peace

You ask the spirits to bring a sense of peace and calm to a situation. You can spend 2 ki points to cast Calm Emotions.

Request Rejuvenation

You call upon spirits to rejuvenate one creature you are touching. As an action, you may spend ki points to heal one creature you are touching. The target heals hp equal to 5 times the number of ki points spent.

Request Speed

You call on spirits to quicken your actions in battle. You can spend 4 ki points to cast haste.

Ethereal Flight

At 11th level, you use your understanding of the spirit realm to be able to walk upon the fabric of reality itself. You spend 3 ki points to grant yourself a fly speed equal to your walking speed for 1 hour.

Capture Soul

At 17th level, you can try to capture the soul of another creature. When a creature you can see suffers a critical hit or is reduced to 0 hit points or dies you can use your reaction to attempt to capture its soul. If the target must succeed on a Wisdom saving throw against your Ki DC or it instantly dies and you capture its soul into a vessel or object (a creature can choose to fail this save). A captured soul can only be resurrected by an 8 hour ritual only you can perform for no material cost even if the original body was destroyed. While captured in this way, you can speak to the soul and understand its responses, and it must answer your questions truthfully.