Need Citation, Ability Damage + Damage Bonuses

[Ashiel]

Hey, I'm doing some research for a GM friend of mine. If memory serves, effects that add damage, or increase damage rolls do not apply to ability damage, right?

If so, can anyone point me in the direction clarifying this point? Thanks.

EDIT: Specifically, knowledge devotion doesn't allow you to increase ability score damage by +X, correct?

[Douglas]

Complete Arcane page 84, under Weaponlike Spells and Sneak Attacks, specifies that sneak attack damage on spells that deal ability damage is negative energy hit point damage instead of additional ability damage. By strict RAW this only applies to sneak attack damage, but Rules Compendium page 136 extends it to all precision damage and it's a reasonable extrapolation that it should apply to all damage bonuses.

[Ashiel]

Thanks you very much. Anyone else?