5 : The Freezing God -

Ainz uses this conflict as a "rulership experiment". After Cocytus suggests sparing some lizardmen, Ainz agrees, marking a shift from mindless destruction to the strategic integration of conquered races into his burgeoning Sorcerer Kingdom.

The story concludes the war between the Great Underground Tomb of Nazarick and the unified lizardman tribes. After the lizardmen successfully defended against an initial weak wave of undead, the "Freezing God"—the Floor Guardian —is sent by Ainz Ooal Gown to personally finish the task. Core Themes and Plot Points 5 : The Freezing God

The title refers to Cocytus, the ruler of Nazarick's frozen 5th floor. Unlike earlier battles where Nazarick used mindless undead, this chapter highlights the overwhelming power and cold martial honor of a high-level Guardian. Ainz uses this conflict as a "rulership experiment"