Revising...
Curse of Decrepitude (Su): Every time Hamaculi hits with its right hoof, its opponent must succeed on a DC 31 Fortitude save or prematurely age. This imposes a -4 penalty to Strength, Dexterity, and Constitution, and causes the victim's hair to turn white, skin to wrinkle, and posture to stoop. The penalty is not cumulative. Should the victim's Con drop to 0 they will die. This effect is permanent, but can be removed by a wish, miracle or break enchantment spell, or by drinking an elixir of youth or similar potion (the elixir removes the curse but does not reduce the drinker's age as it normally would). A spellcaster must succeed on a DC X level check to use break enchantment to remove the curse.
Additionally, the opponent must succeed on a DC X Reflex save or its armor and clothing rots away or dissolves into rust. Hamaculi can also use its right hoof attack to destroy unattended objects up to a 10-foot-cube in size. Unattended magical items are allowed a DC X Fortitude save to avoid dissolution. The save DCs are Constitution-based.