A Karthium boss is a major character belonging to Karthus.
- Pumpgrim Reaper, a reaper that throws skulls and uses its scythe to lure victims
- Demonishife, a dark sorceress luring lumicons and summons flying imps
- Vista's Cat, a vistaling cat that sends a-lpha to the warpler
- Pumpgrim's Eagle, an eagle that can carry clastrones and destroy buildings.
- Pukalo Reincarnation, a shifeling that contributed to the Karthus disaster
- The Anonymous Commisioner, a heavily muscular shifeling attempting to destroy the Discord Tetramount
- Tengrimu, the largest clastrone that contributed to the Electrotraitor disaster.
- British demon, a lured member of the Red color constant that crossteams with other members in attempt to jail or destroy ports of the Discord Tetramount
- Partners of Shife, the largest shifeling formed by the Karthus disaster
There are karthium bosses which are neutral, not all of them are burdenates
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