User blog comment:Xyclone010/Fury and Energy Items Idea/@comment-24792363-20140703210952/@comment-24862418-20140705125731

I think you mean FURY regen. One of the old ideas I had (I posted it but it was removed as the items has too many passive), was taking damage regen 2 - 4 Fury. About reduce Fury cost, there are reasons that they want it to be 50 (Renek) and 100 (Shyvanna). Anyway, with the bonus Fury regen add, it has the same effect as your idea.