Katarina spends 1 Moxie Point to make two Unarmed Strikes as a Bonus Action.

Katarina uses a Bonus Action to gain 1d8 plus 18 temporary hit points for 10 minutes.

Katarina can use a Bonus Action to Dash, Disengage, or Hide.

Ear for Deceit lets her determine whether a creature is lying with a minimum result of 8 on Wisdom Insight checks made to judge deception. Eye for Detail lets her use a Bonus Action to make a Wisdom Perception check to spot a hidden creature or object, or an Intelligence Investigation check to uncover clues. Insightful Fighting lets her use a Bonus Action to make a Wisdom Insight check contested by a creature's Charisma Deception check. On a success, she can use Sneak Attack against that creature for 1 minute without Advantage, provided she does not have Disadvantage.

Katarina gains Fisticuffs. While unarmed or wielding only Pugilist weapons, wearing light or no armor, and not wielding a shield, she can make a Bonus Action Unarmed Strike, use a 1d8 Fisticuffs die for Unarmed Strike or Pugilist weapon damage, and use mastery properties with improvised weapons. She also gains Iron Chin, setting her base unarmored AC to 12 plus her Constitution modifier.

Katarina has 13 Moxie Points. She can spend them on Brace Up, One-Two Punch, and Stick and Move. Brace Up grants temporary hit points, One-Two Punch makes two Bonus Action Unarmed Strikes, and Stick and Move makes an Unarmed Strike followed by Dash or Disengage.

Katarina can use Dig Deep as a Bonus Action for 10 minutes, gaining resistance to bludgeoning, piercing, and slashing damage and ignoring Exhaustion levels below 6.

Katarina can use Dig Deeper as a Bonus Action for 1 minute, gaining Dig Deep's benefits and using School of Hard Knocks twice per turn. At Pugilist level 20, she can use it twice per Long Rest.

Katarina's Unarmed Strikes deal 1d8 bludgeoning damage, or Force damage through Moxie-Fueled Fists, and she can make an additional Unarmed Strike as a Bonus Action.

Katarina gains Uncanny Dodge, allowing her to use a Reaction to halve the damage from one attack that hits her when she can see the attacker.

When damaged, Katarina can use a Reaction to regain all expended Moxie Points. If Bloodied, she also gains temporary hit points equal to 4 times her Pugilist level. She can spend Moxie to add her Fisticuffs die to a failed Strength, Dexterity, Constitution, or Charisma check through Swagger Streak.

Katarina makes an Unarmed Strike and can immediately Grapple or Shove the target. Against a Grappled creature, Compression Lock deals 1d8 plus 5 bludgeoning damage at the start of her turn.

Katarina spends 1 Moxie Point to make an Unarmed Strike and then Dash or Disengage.

Katarina makes a Wisdom Insight check to study a target, enabling Sneak Attack against it for 1 minute without Advantage if successful.

Katarina is proficient with light armor, simple weapons, hand crossbows, longswords, rapiers, and shortswords. She is also proficient with thieves' tools. She has four Rogue skill proficiencies, Expertise in Athletics and Stealth, and Sneak Attack for 4d6 extra damage once per turn when its conditions are met.

Katarina chooses the Inquisitive Rogue archetype. She gains Ear for Deceit, Eye for Detail, and Insightful Fighting.

Katarina gains an Ability Score Improvement, used to increase Strength by 2.

Katarina gains Expertise in Athletics through Muscle Mass, increasing her Athletics proficiency bonus to double proficiency.

Katarina gains Evasion. On a successful Dexterity saving throw against an effect that normally deals half damage, she takes no damage, and on a failed save she takes half damage.

Katarina gains an Ability Score Improvement, used to increase Constitution by 2.

When Katarina hits with an Unarmed Strike, she can deal its damage and also Grapple or Shove the target.

Katarina gains the Squared Circle Pugilist subclass. Groundwork allows Compression Lock damage to Grappled creatures, Disadvantage on saves or checks against her Grapple or Shove DC by spending Moxie, and combined Grapple and Shove effects after an Unarmed Strike. Muscle Mass grants Expertise in Athletics.

Katarina gains an Ability Score Improvement, used to increase Charisma by 2.

Katarina can attack twice when she takes the Attack action. She can spend 1 Moxie Point on Haymaker to deal maximum damage with a successful Unarmed Strike or Pugilist weapon attack, regaining the point on a hit.

Her Unarmed Strike and improvised weapon damage can be Force damage instead of their normal damage type.

After using Bloodied But Unbowed while Bloodied, Katarina can gain a bonus to Unarmed Strike and Pugilist weapon damage equal to her Constitution modifier plus her Exhaustion levels. She also gains Meat Shield, receiving Half Cover while Grappling and potentially redirecting a missed attack to a Grappled creature.

Katarina gains an Ability Score Improvement, used to increase Strength by 2.

Once per turn, Katarina can deal an extra 1d12 damage with an Unarmed Strike or Pugilist weapon attack, or forgo that damage to make the target vulnerable to maximum damage from the next hit or give it Disadvantage attacking anyone other than her.

Katarina's Strength counts as doubled for carrying capacity, her Unarmed Strikes are critical hits against objects, and her jump distance is doubled. She can also remove one Exhaustion level or end Blinded, Charmed, Deafened, Frightened, Paralyzed, Poisoned, Restrained, or Stunned on herself once per Long Rest through Shake It Off.

Katarina gains Reliable Talent. Whenever she makes an ability check using a skill or tool proficiency, a d20 roll of 9 or lower counts as a 10.

Katarina gains an Ability Score Improvement, used to gain the Tavern Brawler feat. She can use improvised weapons proficiently, add proficiency to improvised weapon damage, and grapple after hitting with an Unarmed Strike. Her Strength increases by 1.

Katarina has Advantage on Strength, Dexterity, and Constitution saving throws. She can spend 1 Moxie Point to reroll a failed saving throw, using the new roll.

When she rolls Initiative, Katarina can remove one Exhaustion level and regain uses of Down But Not Out, Dig Deep, and Shake It Off once per Long Rest.

Katarina gains an Ability Score Improvement, used to gain the Athlete feat. Her Strength increases by 1. She can stand from prone using only 5 feet of movement, climb without extra movement, and make running jumps after moving only 5 feet.

Katarina gains Blind Sense, allowing her to detect the location of any creature within 10 feet that is not behind total cover, even if she cannot see it.

Katarina gains Slippery Mind, granting proficiency in Wisdom saving throws.

Katarina gains Elusive. No attack roll has Advantage against her while she is not Incapacitated.

Katarina gains Stroke of Luck. Once per Short or Long Rest, she can turn a failed ability check into a success or treat a missed attack roll against a target within range as a hit.

While Grappling a creature, Katarina gains Heavyweight benefits, counting as one size larger for Grapple and Shove options and moving a Grappled creature of her size or smaller without extra movement.

Katarina can always find a place to perform, from a roadside ring to a noble court. She can secure modest food and lodging for herself and her companions by performing, and local performers, tavern owners, and fans recognize her professional reputation.