Board Thread:Editing help desk/@comment-7820490-20130405014606/@comment-1990160-20130405014955

>"verified source outside of the game"

Data is extracted from the game files. Anything else would be silly? Generally, people on the PBE notice it first, then the stats change comes out with the patch, surprising nobody. A registered user is then allowed to edit the relevant Data template for the champion, changing the stats displayed.