Bjorn Ironside Ragnarson

Improved Survivor. Bjorn Ironside regains 15 hit points at the start of his turn if he has at least 1 hit point but fewer hit points than half his hit point maximum. 

Mariner. Bjorn Ironside can hold his breath underwater for twice as long and has proficiency with navigator's tools. Bjorn Ironside is also naturally adapted to cold climates, as described in chapter 5 of the Dungeon Master's Guide.

First Axe. A weapon deals two extra dice of its damage when Bjorn Ironside hits with it (included in the attack).

Legendary Resistance. 3/day.

Feats. Alert. Athlete. Fighting Style (Dueling). Medium Armor Master. Savage Attacker. Shield Master

Action Surge. On your turn, you can take one additional action. Once you use this feature, you must finish a short or long rest before you can use it again.

Multiattack. Bjorn Ironside makes three melee attacks or three ranged attacks.

Battleaxe of Speed. Melee Weapon Attack: +14 to hit, reach 5 ft, one target. Hit: 22 (3d8 + 9) slashing damage. If Bjorn Ironside scores a critical hit, it rolls the damage dice three times, instead of twice.

Javelin. Melee or Ranged Weapon Attack: +12 to hit, reach 5 ft. or range 30/120 ft, one target Hit: 15 (3d6 + 5) piercing damage.

Battleaxe of Speed attack. 

Parry.  Bjorn Ironside adds 7 to his AC against one melee attack that would hit it. To do so, Bjorn Ironside must see the attacker and be wielding a melee weapon.

Bjorn Ironside can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Ragnarson regains spent legendary actions at the start of its turn.

• Skullcracker Shield. Bjorn Ironside makes a shield bash attack: 
  • Shield Bash. Melee Weapon Attack: +12 to hit, reach 5 ft, one target. Hit: 18 (2d10 + 6) bludgeoning damage. The target must make a DC 22 STR save or be knocked prone. 
•  Blessed for War (Costs 2 Actions). Bjorn Ironside benefits from the dodge action until the start of his next turn.
• Rage of the Thunderer (Costs 3 Actions). Bjorn Ironside adds 8d6 thunder damage on the next attack of his that hits.