The rules have changed. With zombies, there are no written laws, no grudge between individuals or people, no etiquette or castes. Everyone dies the same and resurrects to join the horde the same. Even frontiers between species are shattered: from now on, it’s only survivors against zombies.
As survivors were learning basic combat spells and enchantments from fellow magicians, they also discovered the ways to bind a familiar and share new powers with their animal friends. Survivors going from quest to quest alongside familiars is slowly becoming a common sight.