Sneak Attack

From D20advanced

SNEAK ATTACK		Combat, Ranked

When you make an attack on a foe you have Combat Advantage against, increase your attack's damage bonus by +2. You cannot sneak attack an opponent you cannot accurately perceive (due to concealment) and opponents immune to critical hits suffer no additional damage. Additional ranks increase your Sneak Attack damage bonus by +1, to a maximum of +5. Your total damage bonus is limited by the campaign's power level.

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