You can attack twice, instead of once, whenever you take the Attack action on your turn.

Jiro makes two greatsword attacks when taking the Attack action. He can make a third attack as a bonus action while frenzied, beginning on the turn after he enters the frenzy.

When you use Frenzy while raging, you can make a single melee weapon attack as a bonus action on each of your turns after the first. When the rage ends, you suffer one level of exhaustion.

Jiro enters a battle trance, gaining advantage on Strength checks and Strength saving throws, resistance to bludgeoning, piercing, and slashing damage, and a +2 bonus to melee weapon damage using Strength. He can use this three times per long rest.

Jiro attacks with reckless abandon, gaining advantage on melee weapon attacks using Strength this turn. Attacks against him have advantage until his next turn.

Jiro uses his greatsword, dealing 2d6 slashing damage plus 6 from his Strength modifier and rage bonus while raging. On a critical hit, Brutal Critical adds one additional greatsword damage die to the critical damage.

While not wearing armor, your Armor Class equals 10 + your Dexterity modifier + your Constitution modifier. Your warforged Integrated Protection trait adds +1 AC while not wearing armor.

You choose the Path of the Berserker. You gain the Frenzy feature.

You have advantage on Dexterity saving throws against effects you can see, such as traps and spells.

Your speed increases by 10 feet while you are not wearing heavy armor.

You have advantage on initiative rolls. Additionally, if you are surprised at the beginning of combat and are not incapacitated, you can act normally on your first turn if you enter your rage before doing anything else.

Once per turn when you score a critical hit with a melee weapon attack, you can roll one additional weapon damage die when determining the extra damage from the critical hit.

At 4th level, you increased your Strength score by 2, raising it from 16 to 18.

At 8th level, you increased your Constitution score by 2, raising it from 12 to 14.

You are resistant to poison damage, immune to disease, do not need to eat, drink, or breathe, do not need to sleep, and cannot be put to sleep by magic. You can finish a long rest in six hours while remaining motionless and aware.

You do not need to sleep, and magic cannot put you to sleep. You can spend six hours in an inactive, motionless state instead of sleeping during a long rest.

You have advantage on saving throws against being poisoned, and resistance to poison damage.

You have proficiency in one skill and one tool of your choice. These proficiencies are included below as Perception and Smith's tools.

You retain the respect of soldiers and know how to find food, shelter, and basic aid among military units, forts, and veterans. You can identify the insignia and military customs of many armies.