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Martial Archetype
Sohei
Sohei are warrior-monks, training in arts both martial and mystic. Able to fight both fully-equipped and completely unarmed, sohei are versatile combatants equitably suited for pitched battles, duels, and ambushes. Through meditation and deliberate training, these fighters learn to harness the energy of ki, wielding it as a tool to perfect their calm and evasive methods of combat. Many samurai take up the styles of the sohei, and militant monk orders train themselves in its ways, following a path of self- improvement and sovereignty.
Unarmored Technique
At 3rd level, you are trained in fighting even when unarmed and unarmored, as to be ready for battle in any situation. Your unarmed strike uses a d4 for damage, and while you are wearing no armor and not wielding a shield, your AC equals 10 + your Dexterity modifier + your Wisdom modifier.
Ki
Starting at 3rd level, your training allows you to harness the mystic energy of ki. Your access to this energy is represented by a number of ki points. You have a number of ki points equal to 1 + half your fighter level.
You can spend these points to fuel various ki features. You start knowing three such features: Deflect Blows, Patient Defense, and Step of the Wind. You learn more ki features as you gain levels in this class.
When you spend a ki point, it is unavailable until you finish a short or long rest, at the end of which you draw all of your expended ki back into yourself. You must spend at least 30 minutes of the rest meditating to regain your ki points.
Deflect Blows. When you are hit by a melee weapon attack, you can use your reaction and spend 1 ki point to deflect it. When you do so, the damage you take from the attack is reduced by 1d10 + your Dexterity modifier.
Patient Defense. You can spend 1 ki point to take the Dodge action as a bonus action on your turn.
Coiled Snake. When you roll for initative, you can spend 1 ki point to treat the d20 roll as a 10. You can choose to do so before or after making the roll. If you do so while surprised, you are no longer surprised.
Ki Multiclassing
If you gain the Ki feature from multiple sources, you simply add together your ki points into a combined pool. For instance, if you were a level 3 Fighter Sohei, and a level 4 Monk, you would have 6 ki points, which you could spend using features from either class.
Calm Combatant
Starting at 7th level, you have advantage on saving throws to avoid being charmed or frightened.
Additionally, when you use your Second Wind, you can also take the Dodge or Disengage action as part of the same action.
Ki-Empowered Strikes
Starting at 7th level, your unarmed strikes and attacks with weapons count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.
Balanced Blades
At 10th level, you gain the ability to channel ki directly into your weapons, harnessing all aspects of your fighting style to strike down your opponent. When you hit with a weapon attack, you can spend 2 ki points to increase its damage. The damage equals your proficiency bonus + your Dexterity modifier if the attack used Strength, or your proficiency bonus + your Strength modifier if the attack used Dexterity.
Evasion
At 15th level, your instincts let you dodge out of the way of certain area effects, such as a blue dragon’s lightning breath or a fireball spell. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail.
Unerring Accuracy
At 18th level, your mastery of weapons grants you extraordinary accuracy. If you miss with an attack roll on your turn, you can reroll it. You can use this feature only once on each of your turns.