Spawn of Kyuss
Also known as “unkillable undead” by those who know of them. Basically, powerful undead creatures infected by Kyuss Worms that burst forth from the undead creature to infect another target. They just have to touch a person or hurl worms at them to infect them. The party has never seen these worms thrown farther than 10 feet. The worms burrow into the target’s brain, and then the target hatches multitudes more. The worms must be removed from the target before they reach the brain. The Spawn also project an aura of fear that has reduced many brave adventurers to quivering children; this effect can be quite severe, but even those with strong willpower can avoid being, at least, shaken by it. Sometimes those who have been infected but survived develop a supernatural disease resembling dementia in its early stages. The zombies seem to have some defense against non-slashing damage and are able to heal themselves over time.