For your considferation: Ghouls

[KevinJ]

Ghoul
ST Var DX Var IQ Var MA Var Prot var
Attacks:......adjDX....Dmg...Effect
Bite..............10........1-3....HTH; Infect: 4/ST save
Claw.............10........1-2....HTH
Knife............10........1-2
Club.............10........1-3
Sling............10........1-2
Thrown Rock.10........1-4

Desc: These are individuals who have been infected with an alien parasite. They appear to be rotting corpses that shamble around in the darkness and underground looking for more hosts for the parasite.
Ghouls carry weapons and wear armor that they were wearing when they transformed, they will not pick up weapons or don armor out of the blue, though a weapon using ghoul will pick up a weapon if disarmed.

The Ghoul has the stats of the original victim with the following modifications. ST+2, DX-2, IQ-4, MA-2. They are nearly immune to thrusting/stabbing/piercing attacks, but cutting and crushing attacks do full damage.

Anyone bitten by a ghoul must make a 4/ST save or be infected by the parasite. If they fail the save, other ghouls immediately stop attacking that individual. The individual gets one more 4/ST save after 1 hour, success means that their body rejected the parasite and it dies (the character is now immune to future infection and Ghouls ignore the character as above). Failure means they transform into a Ghoul. It takes about 8 hours for the full transformation to take place.

Cleansing will kill the parasite, stopping the infection or freeing the individual, though the individual may die afterwards from damage taken in an attack or while infected.

Feel free to critique.
I treat the nearly immune to 1 hit per die + magic bonuses.