I don't know exactly how it works but it had something to do with putting your charisma in the negatives while you have the ring equipped (which keeps your charisma at 18 so you don't die) so that when you unequip it your charisma loops around to 25.
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When you go to 0, you die, but keeping the ring on magically sets your charisma to 18.
But if you use the rod to go to -1, the game used to loop around to 25.
IDK if this works anymore.