Krieg/Skill tree

Bloodlust
Focuses on ranged combat using a Bloodlust stack mechanic. Dealing damage to an enemy adds a stack of Bloodlust to a maximum of 100. Stacks decay after 3 seconds if you haven’t dealt damage at a rate of 1 stack per second.

Mania
Focuses on powerful melee combat attacks and Health/Fight For Your Life mechanics.

Hellborn
Focuses mainly on elemental effects, particularly setting oneself on fire and some fire-based attacks. Bonuses that apply only when on fire are in.