Valencina, War Hero of the Thumb

Acceleration Round. Valencina begins the fight with 10 Acceleration Rounds (Max 10). This creature can choose to use these Rounds on certain attacks, each round spent give the attack +2 to hit (Max +8). If this creature has no Acceleration Rounds at the start of their turn, all damage they deal is fixed to 1 for the turn. As a Bonus Action, Reload. (Gain up to the Maximum ammunition this creature can.)

Relic: Eye of Odin. A relic from the depths of the city, it grants the user precognition of future events, at the cost of an eye. The user cannot be surprised, even by creatures they cannot see, and gains 30 ft of blindsight. As a free action, the Relic can be activated for 2d4 rounds. For the duration of which, all attacks made against the creature have disadvantage. At the end of their turn, the user takes 1 Fire Damage for each time they've activated the Relic today.

Relic Overheat. If Valencina is hit while the Eye of Odin is active, her armor class is reduced by 4, and she loses 1 Round of Relic activation.

Sottocapo of Famiglia Bognatelli. At the start of her turn Valencina marks an opponent. Attacks she makes against the marked opponent crit on a roll of 18-20. If the marked opponent is downed this turn, gain Thp equal to excess damage dealt.

Shame of the Family. When Valencina falls below half hp, she gains access to a new attack. Until the end of combat, damage from all sources is reduced by 3.

Multiattack: Dueling. Valencina makes two attacks with Colpi di Taglio, and one with Colpi di Punta.

Colpi di Punta. Melee Weapon Attack: +11 to hit, reach 10 ft., 1 target. Hit: 24 (4d8 + 8) magical piercing damage. (This attack can use Acceleration Rounds.)

Colpi di Taglio. Melee Weapon Attack: +10 to hit, reach 5 ft., 1 target. Hit: 19 (2d10 + 8) slashing damage.

Disposal. This move can only be used once, when this unit falls below half hp. Melee Weapon Attack:  +8 to hit, reach 5 ft., 1 target. Hit: 95 (10d10+8) Magical Force Damage. After attack, Valencina gains 1 level of Exhaustion.

Acceleration Rounds: Reload. Gain Ammunition up to the max this unit can have at the start of their next turn.

Sparare!  Valencina orders one Soldato within 100 ft of herself to make an attack action against a creature of her choice.

Riposte. When a critical fail is rolled against Valencina, she can make an attack against the creature that attempted it.

Sparagli! When a creature leaves Valencina's threatened area, she may command 1d4+1 Soldato within 100 ft, to make a ranged attack on the creature that triggered the reaction.

Enter the description for how legendary actions work for your monster here.

Firing Squad (Costs 4 Actions). Valencina commands up to 3 Thumb Soldato to attack a target creature.

Muoviti! (Costs 1 Action). Valencina commands a Thumb Soldato to move. They can move up to their move speed, this movement is unaffected by difficult terrain and does not provoke attacks of opportunity.