Wikia

View on Official Skill Tree Calculator Starting Skill Berserk Gain the ability to go Berserk. While Berserk, use the Aim and Fire buttons to throw punches. Also, you gain resistance to all damage and you regenerate health while Berserking. Duration: 18 Seconds. Cooldown: 60 seconds.					Brick Purge
Tier	Brawler Tree		Tank Tree		Blaster Tree
1	0	5/5	5/5	5/5	0	5/5
2	5/5	0	0	1/5	5/5	0
3	0	5/5	0	5/5	0	5/5
4	5/5		0		5/5
Totals	20		16		20
	Required Level: 61

Becoming an Unbreakable Legionnaire does not require any class mods, but you do need the General Knoxx DLC.

SMSHRMK1/ Unbreakable Legionnaire Build