As a bonus action, Kaisen can regain 1d10 + 15 hit points. He must finish a short or long rest before using this feature again.

Kaisen can use a bonus action to study a creature or object and learn whether it has an equal, superior, or inferior Strength, Dexterity, Constitution, Armor Class, current hit points, or total class levels compared to him.

Kaisen can add one superiority die to a weapon attack's damage when using a maneuver, and can use Precision Attack to add the die to an attack roll, Menacing Attack to frighten a target on a failed Wisdom save, or Riposte to make a reaction attack after a creature misses him in melee.

When Kaisen hits a creature with a weapon attack, he can expend a superiority die to frighten it. The target must succeed on a DC 18 Wisdom saving throw or be frightened of him until the end of his next turn.

Kaisen can expend a superiority die and add the result to a weapon attack roll, potentially turning a miss into a hit.

When a creature misses Kaisen with a melee attack, he can use his reaction and expend a superiority die to make a melee weapon attack against it.

Choose the Defense fighting style. While wearing armor, Kaisen gains a +1 bonus to AC.

Kaisen can take one additional action on his turn. He can use this feature once before resting, and gains a second use after a short or long rest at fighter level 17, which he has not yet reached.

Kaisen is a Battle Master. He gains proficiency with smith's tools. He has four superiority dice, which are d10s, regained on a short or long rest. His maneuver save DC is 18, calculated as 8 + proficiency bonus + Strength modifier. He knows the maneuvers Menacing Attack, Precision Attack, and Riposte.

Kaisen increases his Strength by 2, raising it from 16 to 18.

Kaisen can attack twice, instead of once, whenever he takes the Attack action on his turn.

Kaisen increases his Strength by 2, raising it from 18 to 20.

Kaisen can add half his proficiency bonus, rounded down, to any ability check that does not already include his proficiency bonus.

Kaisen increases his Constitution by 2, raising it from 14 to 16.

Kaisen can reroll a failed saving throw. He must use the new roll and can use this feature once per long rest.

Kaisen increases his Constitution by 2, raising it from 16 to 18.

Kaisen can attack three times whenever he takes the Attack action on his turn.

Kaisen can use Indomitable twice between long rests.

Kaisen gains the Sentinel feat. When he hits a creature with an opportunity attack, its speed becomes 0 for the rest of the turn. Creatures provoke opportunity attacks from him even if they Disengage, and he can use his reaction to attack a creature within his reach that attacks a target other than him.

Kaisen retains the respect and loyalty of soldiers who recognize his discipline and experience. He can identify military ranks, camps, insignia, and basic army organization, and he can secure temporary shelter and aid from fellow soldiers or allied forces.