Not all monks where able to train in a monastery or school to develop their skills. Some had to develop their own style and and use whatever they could find to defend themselves. This could have been on the streets of a city, fighting rings, or within tavern brawls.

Bonus Proficiencies

When you choose this tradition at 3rd level, you gain proficiency in the Insight skill if you don't already have it. Your time fighting has given you the ability to read people. You also gain proficiency with improvised weapons. Improvised weapons are monk weapons for you as long as they lack the heavy or special properties

Reactive Strike

Starting when you choose this tradition at 3rd level, you can exploit an opening in your enemies defenses when you dodge their attacks. Whenever a creature misses you with an while within 5 feet of you, you can use your reaction to expend a Ki point to make a melee attack with a unarmed strike or an improvised weapon against that creature.

Ki Empowered Weapons

Your attack with improvised weapons count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Knockout Punch

At 6th level, you gain the ability to channel your Ki into a single powerful strike. Once per turn, when you hit a creature with a melee weapon attack, you can expend up to 3 Ki points to deal additional damage. The extra damage is one extra Martial Arts die per Ki point spent.

Ignore Pain

Beginning at 11th level, you can resist the force of oncoming strikes. When you take damage, you can expend Ki to roll a Martial Arts die and reduce the damage by the amount rolled. You can increase the amount resisted by spending additional Ki points, for a maximum of of 5 Ki points.

Destructive Blows

At 17th level, you gain the ability to channel your Ki to make your strikes deal devastating blows. When you roll a Martial Arts die for damage, you may instead spend a Ki point to maximize the damage of the die, instead of rolling.