The Horned Rat is the cultural deity of the Skaven and a minor Chaos god in Warhammer, becoming a major god with the setting's reinterpretation as Age of Sigmar. Often depicted as a gigantic, humanoid rat with multiple horns, it is an entity of great malevolence that has shaped the Skaven into miniature representations of itself. The ultimate goal of the Horned Rat is the conquest and destruction of all other species, the rise of Skaven as a supreme power and the spread of disease and misfortune.
Even within Skaven society the Horned Rat's influence encourages their constant in-fighting and bickering. Though not officially ranked among the Chaos Gods until recently, the Horned Rat has grown closer in relations to Nurgle. This is likely due to both being deities of disease, though Nurgle doesn't display the same levels of deception and deliberate cruelty as the Horned Rat.