I use a combo with my Rogue to kill the target within one turn. It goes like this:
My rogue has Slaying in Action feat (MP II 131) which lets me use my sneak attack again, when I use a action point. So every time I hit an enemy with the Daily Power Knockout (PH 121) and knock it unconscious, I spend an action point to do a Coup de Grace. I use a Vicious Weapon that gives a bonus to critical, so when I hit the Coup de Grace the enemy takes damage from my Vicius Weapon, my Sneak Attack and the power I choose to use with the Coup de Grace.
I normally use with the Coup de Grace the power that has the most Weapons. For me it is Precise Incision which deals 3[W] damage. I also have a multi class with ranger, so I apply the Quarry damage to the Coup de Grace as well.
With all that I average 62,5 points of damage in the Coup de Grace alone, which is enough to kill a creature with 125 Hit Points.
I was wondering if there is a way to optimize the damage with the Coup de Grace. I though about, using a power from another class with multiclass.
Which class and power could I use? what´s the best way to deal the most damage during the Coup de Grace?
Is there any other way to improve this combo (items, feats, powers, etc)?
I'm a level 13 rogue, but any ideas would be welcome, regardless of the level.