Bones of the Djinni

Bones of the Djinni are the best available +damage and +mana armor for the 'about waist' position. The perm stone skin given by this item provides a total ac of -37, a noteworthy addition to it's damage and mana. This item is found in the possession of Djinni in the Air Citidel.

This is what identify reveals about this weapon:

Object 'bones djinni' is type armor, extra flags glow hum anti-evil anti-neutral.
Weight is 2, value is 5555, level is 92.
Armor class is 7.
Worn:Takeable Waist
Affects damage roll by 6.
Affects mana by 300.
Affects stone skin by 66.
Affects hit roll by -15.