Because of Karthus's K/D/A and utility, he has a somewhat poor overall win rate. He does best in the late game, with a winrate of 54.4% in that phase. Unfortunately, he does worst in the early game, where Karthus's winrate is 45.1%., The difference between his best and worst game phases is a large 9.3%. This sizeable difference indicates that his power spikes and fades in different phases of the match. Plan accordingly.
In the current meta, Karthus is not very popular. He has been selected in only 2.7% of recently ranked rounds. He is rarely banned during champion select. Obviously, very few players see him as a real threat. In the latest ranked games, Karthus was banned 1.6% of the time.
Karthus is played mostly in the jungle position. This occurs in 62,1% of his matches. Yet, jungle Karthus has the highest win rate (48,3%) of all positions but is less popular of a position (played 18,8% of the time). Currently, Karthus's meta game is focused on dealing damage. In particular, his build should mostly be focused on magical damage. Dealing physical damage is the least important part of Karthus’s gameplay.
You should anticipate having to dedicate a decent amount of time practicing and learning to get good at playing Karthus. Most League gamers consider he is an average difficulty champ to get good at. Karthus mostly does magic damage (91% of his total damage). He doesn't deal much of other damage types and should not be considered a hybrid damage dealer..
Karthus deals a lot of damage during a typical game (31.095 damage). You should focus on building him as a powerful champ to destroy your opponents.
If you are looking for a dominating carry, then you should definitely consider this champion. He has one of the absolute best kill counts in League among other champions. Moreover, he has a fairly above average death total with an average of 7.4 deaths per League round. Additionally, Karthus has an average KDA ratio (2.2) with 9.6 assists.
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