Monks of the Shenjo monastery are known for their love of brews. They have learned to brew concoctions that fortify their own battle prowess. These brews started as a way for the monks to enjoy some of the more extravagant and usually frowned upon parts of life. These brews were made to allow monks to relax, and in doing so allow more focus to be placed upon meditation and the subjects ki. After time, these brews morphed into something that not only helped unlock ki, but also bolster ones resolve by using the ki they unlocked.

Ironskin Brew

Once you have become a Brewmaster you have unlocked brews that bolster ones resolve and defense capabilities.

Beginning at level 3, you can bolster your own defense with a special brew.  When you spend a ki point to allow you to use your dodge action as a bonus action, and damage you receive while under the dodge effect is halved.

Stagger

When you become a Brewmaster, you learn to stagger damage that had been dealt to minimize its effect on you. You learn to bolsters your defense allowing you to stand in the way of harm longer for their allies.

Beginning at 3rd level, you have learned to steel yourself against incoming attacks. As a reaction you can spend a ki point to reduce any damage received by 1d8 + con modifier. This increases as you gain levels in this class. Becoming 2d8 + con at level 6, 3d8 + con at level 11, and 4d8 + con at level 17.

Elusive Brawler

Later in training, you learn to become more defensive when you decide to take an offensive stance.

Beginning at level 6, when you hit an enemy with your flurry of blows ability, that enemy has disadvantage on any attacks that target you for their next round of combat.

Purifying Brew

Towards the end of your training you learn to brew a concoction that allows one to purify their own body, or the body of others.

Beginning at level 11, you learn to concoct a brew that can purify ones body. As an action, you can drink this brew to remove one negative condition on yourself. You can make a number of these brews up to your wisdom modifier, and must spend a long rest to make more.

Fortifying Brew

Once you become a true Brew Master, you learn their most defensive concoction. This brew allows you to stand against any and all attacks directed at you.

Beginning at level 17, as a reaction to being damaged, you can spend 3 ki points to become immune to the damage dealt to you. After doing this, you gain resistance to all damage for a number of rounds equal to your constitution modifier. You can only use this brew once per day as you need a long rest to recreate the brew.