User blog comment:GogestickCJ/Grimjaww - Custom Champion Concept/@comment-5992391-20130309082011/@comment-7035639-20130309084308

Thanks :D

And to answer your question, no he does not multiply his AD by 4, he gains Bonus Health based on his bonus AD x 4 at max rank meaning if he has 100 bonus AD (not base AD), at max rank, his ultimate will grant him 100x4=400 bonus health for 8 seconds.

His AD though will increase by 2/3/4 % of his maximum health The bonus does not stack with each other, meaning the bonus AD will not take the bonus HP into account.