Cocytus is a powerful Floor Guardian of the Great Tomb of Nazarick in Overlord, serving under Ainz Ooal Gown. He is an insectoid, ice-themed warrior known for his immense physical strength, martial discipline, and loyalty. As the guardian of the Fifth Floor, he acts as a commander and frontline combatant, often leading military operations for Nazarick. Despite his fearsome appearance, he is honorable, serious, and deeply devoted to his master’s will.