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Phylactery of Long Years
This device slows the aging process by one-quarter for as long as the character wears it. The reduction applies even to magical aging. Thus, if a priest dons the phylactery at age 20, he will age nine months in every 12 that pass; in 12 chronological years, he will have aged just nine years, and will be 29 (physically) rather than 32.
One in 20 of these devices is cursed to operate in reverse.