If you invoke your shrouds, the attack deals 1d6 damage per shroud, minus one shroud if the attack misses, and all your shrouds then vanish from the target. This damage roll never benefits from bonuses to damage rolls, and is in addition to the attack’s damage, if any.
Shroud damage is not explicitly referred to as "extra damage". (By avoiding the game term "extra damage", the miss clause works and makes sense (in most cases).) However we're a little foggy on whether the shroud damage is still somehow embedded in the attack's damage, or if it's a separate damage instance.
To wit: what happens in the following scenarios?
- Target has a shroud on it; assassin in invokes shrouds and rolls a critical hit. Shroud damage is maximized or not?
- Target is a minion who has 2 shrouds on it; assassin invokes shrouds but misses. Minion takes no damage or 1 shroud (and dies)?
- Target has DR and has a shroud on it; assassin invokes shrouds. DR is applied to the total damage or the power's damage and shroud damage separately?