You gain mastery with two Simple or Martial weapons of your choice. Boric has mastery with the Greataxe and Handaxe. Greataxe mastery, Cleave, lets one attack hit a second creature within 5 feet of the first, subject to the weapon mastery rules. Handaxe mastery, Nick, allows the extra attack from the Light property to be made as part of the Attack action instead of as a Bonus Action.

You can use a Bonus Action to enter your Rage, even if you have already used your Bonus Action that turn. Your Rage can also continue if you do not attack or take damage, provided you use a Bonus Action to extend it as described by the Rage feature.

Make a melee weapon attack using Strength. While raging, add the Rage damage bonus to qualifying attacks.

Make a melee or thrown weapon attack using Strength.

Enter a battle rage, gaining the benefits of Rage.

Attack recklessly to gain Advantage on Strength-based attacks, accepting Advantage on attacks against you until your next turn.

Curl into your shell. Until you emerge, you gain a +4 bonus to AC, have Advantage on Strength and Constitution saving throws, are Prone, have Speed 0, have Disadvantage on Dexterity saving throws, and cannot take Reactions.

While you are not wearing armor, your base Armor Class equals 10 + your Dexterity modifier + your Constitution modifier. A shield does not change this calculation unless another feature says it does.

You have Advantage on Dexterity saving throws against effects you can see, such as traps and spells. You do not gain this benefit while Blinded, Deafened, or Incapacitated.

You gain proficiency in one additional skill from the Barbarian skill list. Boric gains Animal Handling. While raging, you can use Strength in place of another ability for certain Strength-based skill checks, as allowed by Primal Knowledge.

When you use Reckless Attack while raging, the first hit you make on your turn with a Strength-based attack deals an extra 1d6 damage. This is the Frenzy benefit of the Path of the Berserker.

You have trained with military weapons and can identify common military ranks, insignia, and procedures. Your background also grants the Savage Attacker Origin feat.

You have experience in military organizations, allowing you to recognize the insignia, ranks, and customs of soldiers and to secure basic hospitality from military forces and veterans who recognize your service. You also retain your Soldier origin feat, Savage Attacker.