Rengar's bone tooth trinket not upgrade-able like other trinkets.
So I have been a Rengar main since the start of season 3 and I hated the rework at first, I have however gotten used to it and still love the champ. What I don't like however is the fact that when you hit late game and you want to upgrade your trinket you can't. There is so upgraded ward option or no oricals lense equivalent. I don't think it's fair that someone who plays this champion often has to choose between a vital Rengar mechanic or helping the team.