Rainbow Storm says it gets damage from F/L/C spell damage (and reduces from Poison spell damage); what exactly does this mean? Does this mean that damage from skills contributes, or only "+X% to [F/L/C] spell damage"? That is, if my sorc has, say, Flamefront that deals 200-300 fire damage, and Frigid Sphere that deals 100-200 damage, does that mean Rainbow Storm gets 300-500 damage from those (or a function thereof)? Or only, say, "+10% fire spell damage" on boots? If the former, does oskill elemental damage also contribute?
Does "innate elemental damage" factor into it?