Silent Hill Death
Your brutality has reached mountainous proportions. The weaker your enemies are, the more damage you inflict (up to 30%). When using melee, you might actually cleave someone in half
The perk gives you up to 30% bonus damage to all attacks, for all weapons, even traps (but only if you are online at the moment the trap triggered). The extra damage is scaled linearly based on the amount of Hit Points that the target has before your attack. If the target is full HP, you get no bonus damage. If target is 0 HP, you get the full +30% damage. The exact formula:
BonusDmg (%) = 30 - targetCurrentHP*30/targetMaxHP
The bonus damage is added at the same time as the "Bonus Damage" weapon perk. It is applied before the "Bonus Ranged Damage" weapon perk. It is applied before DR and DT calculations. For bursts, the bonus is applied for each bullet separately. Bonus damage from critical strikes is also a multiplier of the base damage and since multiplication is commutative (in the ring of real numbers), the order that it's applied doesn't matter.