City of Daggers
Zombies are corpses reanimated through dark and sinister magic.
Because of their utter lack of intelligence, the instructions given to a newly created zombie must be very simple. Uncontrolled Zombies only react to obvious stimulus such as sight and sound, they move single-mindedly to attack the living to the exclusion of everything else.
Zombies are resilient to most Bludgeoning or Piercing attacks, clubs, fists, crossbow bolts and spears do little to phase a zombie, the only sure way to harm them is to chop bits off them until they stop moving (DR5/slashing)