freyar
Extradimensional Explorer
I'm game to adding sickened. I'll also go along with requiring magic to end the disease. I think I'd prefer no level check, following the 1977 Basic version, but I'm open to discussion. I'm not sure, though, why you say DC 21 is auto-rolled by an 11th level cleric --- you can't take 10 on a caster level check.
Disease (Su): Ratwere plague -- bite, Fortitude DC X, incubation period X, damage X Wis. Creatures are sickened while they have Wisdome damage from this disease. Humans reduced to 0 Wis transform into Greater Wererats and regain lost Wis, Dire Rats reduced to 0 Wis transform into Ratweres and regain lost Wis, and other creatures reduced to 0 Wis die. Successful saving throws do not allow the character to recover (though they do prevent damage normally).
Disease (Su): Ratwere plague -- bite, Fortitude DC X, incubation period X, damage X Wis. Creatures are sickened while they have Wisdome damage from this disease. Humans reduced to 0 Wis transform into Greater Wererats and regain lost Wis, Dire Rats reduced to 0 Wis transform into Ratweres and regain lost Wis, and other creatures reduced to 0 Wis die. Successful saving throws do not allow the character to recover (though they do prevent damage normally).