Army of Death - S2.E4

The alliance of the Lizard men win the battle and defeat the army of undead. The defeat guardian Cocytus and the new ability to learn from their mistakes, prove that the guardians can adapt to new situations. Ainz Ooal Gown therefore changes his tactics, ordering Cocytus to bring the Lizard men to their knees and under the rule of the Great Tomb of Nazarick.