Initial save DC: 18 Subsequent save DC: 18 Ability damage: 1d6 constitution Incubation period: 1 hour Demon fever 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 will remove the disease (but not the side-effects). After 24 hours, if the usual fortitude save is failed, a fortitude save at DC 18 is attempted to avoid permanently losing one point of constitution.