Profane Death Blow (3.5e Feat)
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Profane Death Blow [Divine]
You are an unholy slayer, an assassin able to channel negative energy to slay the unrighteous.
Spend one of your rebuke undead attempts to add your Charisma modifier as a profane bonus to the attack and damage roll of your next sneak attack. After channeling the negative energy to power this feat, you must make this attack within a number of rounds equal to your Charisma bonus.
If you have the Death Attack assassin class ability, you may similarly spend one of your rebuke undead attempts to add your Charisma modifier as a profane bonus to the DC of the Fortitude save made to resist your next Death Attack.