The Way of the Ichimon no Hokkyokuguma

Shifter + Polar Bears + Sumo = Success

Maegashira Maneuvers

Starting when you choose this tradition at 3rd level, you can manipulate your enemy’s ki when you harness your own. Whenever you hit a creature with a Grapple or Shove attacks while Shifting, you can impose one of the following effects on that target:

• It must succeed on a Dexterity saving throw or be knocked prone.
• It must make a Strength saving throw. If it fails, you can push it up to 15 feet away from you.
• It can’t take reactions until the end of your next turn.

Sacred San'Yaku

At 6th level, you gain the ability to channel your ki into searing waves of energy. Immediately after you take the Guard action on your turn, you can spend 2 ki points to cast magic circleas a bonus action.

You can spend additional ki points to cast magic circle as a higher-level spell. Each additional ki point you spend increases the spell’s level by 1. The maximum number of ki points (2 plus any additional points) that you can spend on the spell equals half your monk level.

Ozeki Oshi-Zumo

Beginning at 11th level, you can thrust with the power of thousand angry spirits. When you successfully attack a foe with the Shove action, you can spend 4 ki points to cast  thunderwave spell as if it were a 3rd level spell. The saving throw DC for the spell equals 8 + your Wisdom modifier + your proficiency bonus.

Spiritual Shimenawa

At 17th level, your ability to cleanse an area of evil and taint is mighty. Through willpower alone you can raise a spiritual temple around and your friends to protect you from almost any foe. At 17th level you can spend 6 ki points to cast hallow.