Nifft
Penguin Herder
Actually, they don't:Critical hits have a 'damage roll' component, but is automatically maximised, so that Spell Source damage bonuses can be added in.
Critical Hits explicitly tell you not to roll for damage, unless you have some extra damage (from a high-crit weapon, a magic implement, or the like).Compendium said:Maximum Damage: Rather than roll damage, determine the maximum damage you can roll with your attack. This is your critical damage. (Attacks that don’t deal damage still don’t deal damage on a critical hit.)
Extra Damage: Magic weapons and implements, as well as high crit weapons, can increase the damage you deal when you score a critical hit. If this extra damage is a die roll, it’s not automatically maximum damage; you add the result of the roll.
Powers that don't deal damage can't get this extra damage, because the rules explicitly say they can't -- in the quote above, and here:
... but nothing prohibits extra crit damage (rolls) from being added to flat-damage powers which crit.Compendium said:Many powers and other effects grant the ability to deal extra damage. Extra damage is always in addition to other damage. This means an attack that deals no damage can’t deal extra damage.
Cheers, -- N