Does having two sources of damage in one attack count as two damage rolls?

Question

For instance, if an attack power allows you to do "2d8+3 plus 1d6 fire damage", and you're under the effects of a power which gives you "+4 to all damage rolls", would the +4 be added to both the normal damage and the fire damage, or just the normal damage?

For example, the Paladin Utility 6 (PHB) Wrath of the Gods says

The targets add your Charisma modifier to damage rolls until the end of the encounter.

I was wondering if an attack which included two different types of damage roll would be affected twice, such as when the paladin is under the effects of Bless Weapon (DP, Paladin Utility 2):

d6 extra radiant damage when hitting with the affected weapon

Answer 1

Damage rolls as referenced by most rule compendium usually refer to the damage caused by a single attack, no matter the damage types involved. The +4 applies to the overall damage (2d8 + 1d6 + 3) + 4 instead than each type individually. The only real exception to this would be if you caused 2d8+3 bludgeoning damage with your attack action, and then as an extra action you could also do an additional 1d6 fire damage, in which case I would rule that the +4 could apply separately to both, althought I have yet to see an ability which adds +4 to all types of damage. That said, this kind of action is not very well covered by most rulebooks and would ultimately be up to the DM.

Answer 2

Sadly no. It is a single source of damage and so it counts as a single source of damage or a single damage roll.

Answer 3

For Bless Weapon, No

Any time a power lets you roll additional dice for damage not included with the normal attack and it DOES NOT refer to this damage as "Extra Damage", you add your modifiers again. In this instance you used bless weapon which specifically refers to the damage as "extra radiant damage" which makes it a part of the original attack in terms of rolling.

For example the bard power Echoing Weapon from Heroes of the Feywild adds damage to the next attack a weapon makes but this damage is not classified as "Extra Damage" because of this any bonuses that can be applied more than once per turn are applied a second time for that attack.

Echoing Weapon
Encounter + Arcane, Thunder Minor Action Melee 1
Target: One weapon
Effect: Until the end of your next turn, the next weapon attack made with the target weapon deals 2d6 thunder damage to one target of the attack, regardless of whether the attack hits or misses.

In comparison the Assassin's Strike power from Heroes of Shadow allows you to roll an extra 1d10 damage after you successfully hit a creature but this time the damage is referred to as "Extra Damage" and because of that the damage is considered to be part of the original attack and you only roll modifiers once.

Assassin's Strike
Encounter Martial, No Action Personal
Special: Nothing but a short or extended rest can allow you to regain the use of this power.
Trigger: You hit a creature within 5 squares of you with an attack using a weapon.
Target: The creature you hit.
Effect: The target takes 1d10 extra damage from the triggering attack. If the target is helpless, this damage is maximized.