For all you Rengar mains not wanting ferocity to expire.
There is a reason it was changed to decaying after out of combat for a reason.
And that reason was because you could basically just stack up five ferocity back then and instantly one shot someone. It might seem like Rengar has a lot of burst now, but he had even more back then because he could stack up ferocity. The current Rengar actually takes time to stack ferocity, which delays his empowered ability and in turn delays his burst by a considerable amount of time. Moreover, it made Rengar really unfun to play against in lane, as he would win every single trade that he made because of his empowered ability and also gave him considerable sustain since he could keep spamming W.
So although I am open to Rengar changes, I am certainly opposed to letting him stack ferocity.