User blog comment:Fistful of Force/DFG and Eve nerf numbers/@comment-79.175.86.102-20130116221814/@comment-79.175.86.102-20130117152636

Check the patch preview from August or July, I don't recall what exactly but you will hear Morello stating: Evelynn seen some gameplay on Summoner's Rift and we are happy that she is again played, however a very potent combo of Deathfire Grasp and her ultimate is not funny. So we are changing how Deathfire Grasp works.

I paraphrased but you can see it for yourself in patch preview.