Synonyms for Savagery (same or very similar meaning)
WordNet sense 1 (the property of being untamed and ferocious):
savagenessWordNet sense 2 (the trait of extreme cruelty):
brutality, ferociousness, viciousnessWordNet sense 3 (a brutal barbarous savage act):
barbarism, barbarityFrom the ODE community, based on WordNetadd/edit