Talk:Cassiopeia/@comment-25489490-20160111183418

For clarification: Cassiopeia's passive does scale multiplicatively still with Rabadon's Deathcap. But, Rabadon's D-cap scales additively solely when compared to the % increase from dragon buff #1 and 5.

With Deathcap, 1 drag and 500 stacks the %percent% increase of ability power right now is 83.3% exactly. Or, a total of 183.3% of your base ability power. Dragon buff at 500 stacks increases your ap by 7.8% instead of 6% because it interacts with your passive but not rabadons. 5th dragon buff simply adds another 7.8% of your base(un-multiplied) ability power, again.

http://euw.leagueoflegends.com/en/news/game-updates/patch/patch-56-notes

"Dragon buff and Rabadon's Deathcap now interact additively rather than multiplicatively. When these two ability power % modifications (and masteries) interact with Cassiopeia passive, they now give roughly ~12% less bonus ability power at late, late game."