Monk: Four Elements Revised

You follow a monastic tradition that teaches you to harness the elements. When you focus your ki, you can align yourself with the magic of the Worldfont and bend the four elements to your will, using them as an extension of your body. Some members of this tradition dedicate themselves to a single element, but others weave the elements together.
This tradition is especially popular among Ilunite Humans, who can draw upon the Worldfont after passing through the Tower of Midnight in the early 2nd era.  

Elemental Stances - 3rd Level

You may focus the elements in your martial arts utilizing four unique stances: Water, Earth, Air, and Fire.
To enter a stance, you expend 2 ki points. A stance lasts for 1 minute and ends early if you enter another stance.

Water Stance

Tendrils of water whip around your body. Your unarmed strikes gain a reach of 15ft. and you no longer have a limit to how many creatures you can grapple at a time. When you hit a creature no larger than one size larger than you with an unarmed strike, you may make a grapple check using your ki Save DC instead of a contested Athletics skill check. You may also expend all of your movement to move a creature any clear space within 15ft of you.

Earth Stance

You armor yourself with the might of sturdy and enduring stone. You have advantage on all checks to resist being grappled, shoved, and knocked prone. Additionally, you gain Temporary Hit Points equal to your Wisdom modifier (minimum of 1) at the start of every turn.

Air Stance

Gusts of air swirl around you, lifting you and buffeting attacks. Your jump distance is doubled and Patient Defense costs no ki to use. When you hit a creature, you may choose to knock it back up to 10ft.

Fire Stance

Your body is wreathed in roaring flames. Once per turn, you cause an amount of fire damage equal your Wisdom modifier to a creature that you have hit with a monk weapon or an unarmed strike. As a reaction, you may cause an amount of damage equal to your martial arts die plus your Wisdom modifier of damage to a creature that has hit you with a melee attack.

Elemental Control - 6th Level

You have learned to manipulate the elements outside of yourself in small ways. You learn the Create Bonfire, Gust, Mold Earth, and Shape Water cantrips. These use your ki save DC
 

Elemental Resistance - 6th Level

While you are in a stance, you have some resistance to elemental damage. You are resistant to one type of damage while in a stance. Water gives Cold resistance, Earth gives Acid resistance, Air gives Thunder resistance, and Fire gives Fire resistance.
 

Stance Mastery - 11th Level

You learn to combine your elemental control into your stances, enhancing them to new heights.

Water Mastery

As a bonus action, you can spend 2 ki points to make an unarmed strike at any number of creatures within 15ft. You may also choose to try and grapple them as long as they are no larger than one size larger than you. Grappling this way also uses your ki save DC.

Earth Mastery

While in Earth Form, you may spend 2 ki point to make your unarmored AC equal to 13 + your Wisdom Modifier + your Dexterity Modifier. While you have this boost to AC, you may also cast the spell Shield on yourself at will, but your movement speed is halved until the end of your next turn.

Air Mastery

While in Air Stance, you may spend 2 ki points to gain a fly speed equal to your walking speed.

Fire Mastery

While entering Fire Stance, you may spend 2 ki points to be able to add your Martial Arts damage die to the fire damage you deal from your stance.
 

Harmonized - 17th Level

You have learned to use all four elements at once. You may enter any number of stances at once.