Base Class: Barbarian
When the tide of combat flows against him, he stands like a rock. It is the legendary dreadnought who has the might to breach the seemingly unbreachable gates. Legendary dreadnoughts may function as brute force in an adventuring group, but small groups of them make up the most devastating combat units in an army. On occasion, a legendary dreadnought might serve as a champion for a prominent ruler or noble, acting as a strong-arm or engaging in staged combats tor money.
Unstoppable
At 3rd level, you can concentrate your power, turning yourself into an unstoppable force a number of times per long rest equal to half your number of rages (rounded up). This ability grants the character a +20 bonus on his Strength check to break or burst a door or item. Alternatively, the legendary dreadnought can apply the +20 bonus to a single attack roll.
Unmovable
You can concentrate your power, making yourself unmovable a number of times per day equal to half your number of rages (rounded down). When you use this ability you become a bulwark, fixed in place so long as you can plant your feet on solid ground. You can resist up to 8,000 pounds of force, with any attempt to move you requiring a DC 30 Strength check, moving you back 5 feet on a success.
Shrug off Punishment
You gain temporary hit points equal to 4 times your total number of rages remaining (including the one being expended), every time you rage.
Thick Skinned
While rageing, all bludgeoning, piercing, and slashing damage that you take from nonmagical attacks is reduced by 3.