Kal'gerion demon - The RuneScape Wiki

Kal'gerion demons are powerful Infernal demons that can be found in their resource dungeon and the Demonic Ruins. Level 90 Dungeoneering is required to damage the demons. The variants roaming in the Demonic Ruins are aggressive. They can be assigned as a Slayer task by Kuradal, Morvran, Mandrith, or Laniakea.

Delrith (historical), RuneScape Wiki

Kal'gerion demon - The RuneScape Wiki

Kal'gerion Demon Farming - MAD GP right now!

Kal'gerion notes - The RuneScape Wiki

Zebub, RuneScape Wiki

With all the controversy surrounding the new demon butler, let's take a look at how awesome Demons looked in the past, and how awful they look now. : r/runescape

Nechryael - The RuneScape Wiki

Killing kal'gerion demons - The RuneScape Wiki

Kal'Ger the Warmonger - The RuneScape Wiki