Who wins Camille vs Karthus?
MID.GG has 2 high-elo VODs of this matchup so far, not enough games yet to call it.
In 2 high-elo games (latest patch 26.19), Camille won 50% against Karthus. The average game ended 14.5/6.5/9.0 for Camille. That is not enough games yet to say who the matchup favours.
One Camille setup into Karthus takes Grasp of the Undying (Resolve and Sorcery) and builds Trinity Force, Ravenous Hydra and Death's Dance. It shows up in 1 of 2 games. The main alternative is Fleet Footwork (1 game).
Taken from the 2 VODs on this page, patch 26.19.
Every streamer in the library with ranked Camille games, most games first. Each links to their VODs on MID.GG.
MID.GG has 2 high-elo VODs of this matchup so far, not enough games yet to call it.
No rune page repeats yet in the 2 high-elo VODs on MID.GG; one game ran the Grasp of the Undying rune page, building Trinity Force, Ravenous Hydra and Death's Dance first.
The most recent games in this matchup, newest first.

