Karthus bug: He doesn't speak whatsoever.

When playing Karthus on any map (I discovered it on ARAM and tested it in the rift), none of his lines are spoken in any context. Buying an item in the shop, moving, attacking, casting a spell (W and R), taunting, anything that involves him speaking, he doesn't. Not really anything affecting game play, but I'm sure it's not intentional and it is a bit weird playing the game and not hearing the champion at all.