My Stars Without Number-inspired setting mixes fantasy elements with the sci-fi.
Armor Class: 8 (or better)
Hit Dice: 2
Attack Bonus: +3
Damage: 1d6 (unarmed) or by weapon
No. Appearing: 1d20 (or more)
Saving Throw: 14+ (see below)
Movement: 20 ft.
The dead tend to not stay dead on Castor, and the shuffling horrors called zombies are the planet’s most common undead menace. Zombies are walking corpses with a hunger for living flesh. They decay in their undeath, albeit not as quickly as an actual corpse would. Regardless of their state of decay, zombies are not easily mistaken for the living.
Zombies are seldom armed or armored, at least to any great extent. These monsters lack human intelligence, operating almost entirely on an instinctual level. They can make use only of the simplest of tools, but even then not often using them for much more than bludgeons. Of course, some zombies may happen to wear armor or have a melee weapon in hand. Since zombies are undead creatures, they cannot be affected by attacks that require a living body or mind. This includes diseases, poisons, many psionic powers and spells, et cetera. Zombies simply ignore the effects of such attacks. Zombies also never make morale checks. Attacks which damage the body are less effective against zombies since their bodies do not suffer pain, shock, blood loss, and so forth. Such attacks inflict 50% normal damage (round down) unless the attack roll is a natural 20, in which case the attack inflicts full damage as normal.
Castoran zombies occasionally have different stats that make them more dangerous. Some zombies can move at normal human speeds. Others carry terrible infections communicable by bite or scratch. The rarest zombies have human intelligence (but still remain immune to effects that require a living mind) and the ability to mentally command lesser zombies.