Zombie creep

From NWNWiki

Initial save DC: 15
Subsequent save DC: 15
Initial ability damage: 1d4 dexterity
Secondary ability damage: 1d4 constitution
Incubation period: 1 hour
Type: supernatural effect

Zombie creep is resisted upon contraction if the target makes a successful initial fortitude saving throw. After the incubation period, subsequent fortitude saves are attempted to resist the ability damage. Two successful subsequent saves in a row will remove the disease (but not the side-effects).