Demon fever

Demon fever is resisted upon contraction only if the one that was bitten makes a successful initial fortitude saving throw. After the incubation period, subsequent fortitude saves must be attempted to resist the ability damage. If two successful subsequent saves are made it will remove the disease but will not remove the side-effects. After 24 hours, if the usual fortitude save is failed, a fortitude save at DC 18 has to be attempted to avoid permanently losing one point of constitution.