Deadly Juggernaut

Necromancy [death]
Level: Antipaladin* 3, Artificer * 3, Cleric */Oracle * 3, Inquisitor * 3, Paladin * 3
Components: V, S
Casting Time: 1 Standard Action
Range: personal
Target: you
Duration: 1 minute/level
Saving Throw: -
Spell Resistance: -
  With every enemy life you take, you become increasingly dangerous and difficult to stop. During the duration of the spell, you gain a cumulative +1 Luck Bonus on Melee Attack rolls, melee weapon damage rolls, Strength checks, and Strength-based skill checks as well as DR 2/- each time you reduce a qualifying opponent to 0 or few hit points (maximum +5 bonus and DR 10/-) with a Melee Attack. A qualifying opponent has a number of Hit Dice equal to or greater than your Hit Dice -4.