Apocalypse: My Harem System

In a women's prison, former guard Silas Sutton awakens an Ability, binds to a system, becomes overlord. Tames a snow leopard cub, builds an army of beasts. Gathers female followers: Chloe Landon (logistics); Sorceress Queen (foe to servant, leads zombie horde); Stella Ryan serves him; Tanya follows for survival. Facing zombie hordes and rival bases, Silas subjugates Sorceress Queen, crushes enemies, establishes an apocalyptic empire, sweeps wasteland.