Captain Lyra Stormblade

Reactive - Lyra possesses the ability to take her reaction on every turn in a combat, rather than once per round.

Action Surge - Lyra has learned how to push herself beyond her normal limits for a short period of time. On her turn, she may choose to take one additional action. Once she uses this feature, she must finish a short or long rest before she can use it again. 

Seafaring Proficiency - Lyra has proficiency in water vehicles, along with advantage on ability checks against being knocked prone by water or weather. Additionally, she can hold her breath for 10 minutes, and has advantage on attacks against creatures with no swimming speed while underwater, and also on attempts to grapple opponents underwater.

Combat Superiority - Lyra knows manoeuvres that are fuelled by special dice called superiority dice. Superiority Dice: Lyra has six superiority dice, which are d8s. A superiority die is expended upon use, and she regains all expended superiority dice upon awakening after a long rest. Saving Throws:  Some of Lyra's manoeuvres require her target to make a saving throw to resist the manoeuvre’s effects. The saving throw DC is calculated as follows: 8 + Lyra's proficiency bonus + her Dexterity modifier.

Manoeuvres - Lyra knows four manoeuvres, Commander's Strike, Commanding Presence, Riposte, and Trip Attack. 

Trip Attack - When she hits a creature with a weapon attack, Lyra can expend one superiority die to attempt to knock the target down. She adds the superiority die to the attack's damage roll, and if the target is Large or smaller, it must make a Strength saving throw. On a failed save, the target is knocked prone.

Commanding Presence - When Lyra makes an Intimidation, Performance, or Persuasion check, she can expend one superiority die to add the result to the ability check.

Student of War - Lyra has proficiency with Cartographer's Tools.

Thrust - Melee Weapon Attack: +5 to hit, reach 5 ft., one target. On a hit, the target takes 1d8+9 piercing damage, along with an extra 1d6 lightning damage. 

Lightning Whirl - Dexterity Save: DC 14 to hit, all creatures within a 10ft radius. On a failure, the target takes 2d8 lightning damage, and half as much on a success. Also, all creatures within a 5ft radius take 1d6+9 slashing damage and 1d4 lightning damage

Lightning Strike - Ranged Weapon Attack: DC 14 to hit, range 40ft., one target. On a failure, the target takes 2d8 lightning damage, or half as much on a success. As well as this, all creatures within a 10ft radius of the target, excluding the target itself, must succeed a DC 12 Constitution save, or take 1d4 thunder damage (or half damage on a successful save).

Second Wind - Lyra has a limited well of stamina that she can draw on to protect herself from harm. On her turn, she can use a bonus action to regain hit points equal to 1d10 + 4. However, she can only use this feature a number of times equal to 1d4 + her CON modifier + her proficiency bonus per day. She regains the ability to use this feature upon waking up after a long rest. 

Commander's Strike -  Whenever Lyra takes the Attack action on her turn, she may forgo one of her attacks and use a bonus action to direct one of her companions to strike. When she does so, she may choose a friendly creature who can see or hear her and expend one superiority die. That creature can immediately use its reaction to make one weapon attack, adding the superiority die to the attack's damage roll.

Riposte - When a creature misses Lyra with a melee attack, she may use her reaction and expend one superiority die to make a melee weapon attack against the creature. If she hits, add the superiority die to the attack's damage roll.