Part of an adept’s personal quest can be the conditioning of the body. To most this means simply staying in peak physical shape, maintaining great personal discipline, and keeping a healthy and nutritious diet—but so much more can be achieved. Years of specialized training and manipulation of the body’s energy has turned the skin and fists of these adepts into callused armor and weaponry.
Starting at 3rd level, your skin becomes so heavily calloused that weapon blows can glance off of you and your every strike is weighted heavier. Your Armor Class increases by an amount equal to half your proficiency bonus, and your unarmed strikes deal extra bludgeoning damage equal to half your proficiency bonus. However, you cannot gain expertise dice on Dexterity checks requiring fine manipulation (such as when using thieves’ tools).
In addition, you become proficient in the Adamant Mountain combat tradition.
At 6th level, you learn how to focus on a part of your body to make it as unyielding as a boulder. When you take bludgeoning, piercing, or slashing damage, you can use your reaction to spend 2 exertion to gain resistance to bludgeoning, piercing, or slashing damage until the start of your next turn (including against the attack, effect, or spell used to trigger this reaction). Once you have used this feature a number of times equal to half your proficiency bonus, you must finish a long rest before you can use it again.
Starting at 11th level, your incredible physical conditioning pays off as your hands and muscles become as hard and reliable as steel. You gain an expertise die on Strength checks and saving throws, a climb speed equal to your Speed, and creatures can’t gain expertise die on saving throws against your Maneuver DC.
At 17th level, you succeed in transforming your bone, muscles, and skin into being as hard as they can possibly be. You become immune to petrification. In addition, your AC bonus and extra damage to unarmed strikes from Calloused increases to an amount equal to your proficiency bonus and you regain uses of Hard As Stone on after either a short or long rest.