On a Carnage Weapon ("When you roll the maximum result on at least one of this weapon’s damage dice, the target takes extra damage equal to twice the weapon’s enhancement bonus.")- what counts as a damage die? Are we only talking [W]s here, or do things like the extra dice from a critical hit, devastating critical, etc. count as well?
It's only the [W]s and that includes weapons like Gouge that roll 2d6, the "Weapons Damage Die" is defined as the 2d6, so you need a 12 to trigger Carnage. (there was a pretty dumb argument about it, and even though this is clearly RAI and RAW, etv.)