Did anyone give Lucius a joker toxin antidote?..Because I get the feeling no one did…and he is going to become a supervillain soonish.
He did – in the Joker War: War Zone one-shot they talked about how he got the antidote, but at that point it was still working itself out of his system.
As for supervillain…I don’t think so. If anything, it’s more likely he’s being used as a pawn for HALO who have some mysterious plot against Batman.
I just re read that part of the book and antidote was not mentioned.