Chinese artwork Edit
Súbor:Adam Harrington in League of Legends
Karthus is one of five champions voiced by Adam Harrington, the other four being Šablóna:Ci, Šablóna:Ci, Šablóna:Ci, and Šablóna:Ci.
Karthus' ultimate, Šablóna:Ai, has the same name as the Catholic gathering called the "Requiem Mass", which is dedicated to praying for the souls of the deceased.
The old icon for Karthus' passive, Šablóna:Ai was a sheep.
Karthus is one of the four champions to have abilities which allow them to continue to attack after death. Karthus's ability being Šablóna:Ai and the others being Šablóna:Cai, Šablóna:Cai and Šablóna:Cai.
Karthus shares the quote with Šablóna:Ci: " Their pain is my pleasure".
Karthus quote " I will put you...In my book." may be a reference to the anime Šablóna:W.
In Karthus' Chinese splash artworks, he does not have a skull face. This is likely because the use of exposed bones in video-games is explicitly forbidden in China (a famous example is the race Undead in Šablóna:W, where in the American server their bones are exposed, while in the Chinese server they're covered). 
The Statue of Karthus is a reference to the Šablóna:W in Šablóna:W.
Grim Reaper Karthus has the scythe that Šablóna:W is usually depicted to be wielding rather than his usual staff.
The book he is holding in Grim Reaper skin it is known as the "Necronomicon" a fictional book of the dead.
Phantom Karthus is most likely a reference to the Phantom of the Opera, due to the mask on the left side of his face.
Karthus originally was a self-appointed Over-lord of Howling Marsh before his lore changed into being working for Shadow Isles.
Karthus is the fourth member of the famous Pentakill band with Šablóna:Ci, Šablóna:Ci, Šablóna:Ci and Šablóna:Ci. Karthus takes the role of Lead Singer as Pentakill Karthus, "the Deathsinger".
Karthus was present in a fight between Šablóna:Ci and Šablóna:Ci. He was found "dead" at the scene, but he was revived since then. He stated that he was "protecting the inhibitor," referring to something other than the inhibitors on the Fields of Justice. 
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