Ability:
    Increased damage from critical hits.
    Increased regeneration speed of Battle Rage bar.

Getting Butchery XP:
    XP gained by collecting Bloodlusts with the Blood Accumulator. 
    Bloodlust has a 1 in 30 chance to summon when the player 
    deals damage to the mob.


Butchery level to critical damage multiplier

14 levels: 1.3
29 levels: 1.4
49 levels: 1.5
69 levels: 1.6
89 levels: 1.7
100 levels: 1.8
