Unarmored Defense. While the berserker is wearing no armor and wie lding no shield, its AC includes in Constitution modifier.  

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  While following the command of a captain, the berserker gains additional abilities based on the captain's level:   2nd. Rage (Recharges after a Long Rest). As a bonus action, the berserker can enter a rage that lasts for 1 minute. The rage ends early if the berserker is knocked unconscious or if its turn ends and it hasn't attacked a hostile creature or taken damage since its last turn. While raging, the berserker gains the following benefits:

• The berserker has advantage on Strength checks and Strength saving throws.
• The berserker deals an extra 2 damage when it hits a target with a melee weapon attack.
• The berserker has resistance to bludgeoning, piercing, and slashing damage.

  6th. Relentless (Recharges after a Long Rest). If the berserker is reduced to 0 hit points but not killed outright, it can drop to 1 hit point instead.   10th. Rage. The berserker can rage twice before requiring a long rest, and it deals an extra 3 damage when it hits a target with a melee weapon attack while raging.   14th. Brutal Critical. The berserker deals one extra die of damage on a critical hit.   18th. Rage. The berserker can rage three times before requiring a long rest, and it deals an extra 4 damage when it hits a target with a melee weapon attack while raging.