I've been thinking about unconsciousness and performing a a coup de grâce lately. It came up in our game this past week and I want to make sure I'm understanding it correctly.
While a creature is unconscious it is helpless, it can't take actions and it takes a -5 penalty to all defenses.
While a creatures is helpless, it grants combat advantage.
Combat advantage grants a +2 bonus to attack rolls.
I read this as a net +7 bonus to an attack roll (or -7 penalty to all defenses, however you read it) to Coup de Grâce. Is this a correct reading?