User blog comment:Jake.butdorf/Obliviana the elemental Archmage/@comment-6385806-20130308224205/@comment-5695639-20130309052649

You do realize that True Damage is a flat rate that never scales with anything else, if there's a scaling, then it means that it's getting whatever respective stat it scales off of. In this case. If you have 416 AP currently at 100% scaling, then it'll do an additional 516 true damage. To avoid being incorrect, I had to play a custom game as Darius to insure that his Ult actually scales with his AD. It does. The differences is that your ability isn't an Ultimate, while his is, as well as the fact only 0.75% of Darius' AD scales with the True Damage. This is indeed an overpowered ability regardless of the fact Obliviana cannot use this until level 3 without a mana item, it would sap nearly all her mana, but by mid-late game, her Passive and Ult synergizes with it far too well to be a coincidence. Her ult would be the same AoE radius as Nasus' Spirit Flame.

Also keep in mind that 100% scaling is the FULL amount of that stat, not a margin.