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.

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Loot From 1000 Kal'gerion Demons, Slayer Codex ep. 3