I'm looking at Ghoul Fever and it says that, but a few lines up it says the save is Fort DC 13, so I'm not sure what they mean by the charisma based part.
1 Answer
The note is telling you that the Save DC of the disease is based, in part, on the Ghoul's Charisma modifier. This is only important if the Ghoul is (de-)buffed in some way, or if you are creating a modified version of the Ghoul with different stats. It is not normally relevant information.
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5\$\begingroup\$ +1 for emphasizing that the information is only relevant if you have a ghoul with a different Charisma score than usual (though remember debuffs are equally possible). \$\endgroup\$– KRyanApr 2, 2014 at 18:13