Dragon Bone Ring

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Found this in the Drac Lair. Mostly useless except as a cp:

recite identify ring
You recite a scroll of identify which dissolves.
You feel informed:
Object 'dragon bone ring cp', Item type: ARMOR
Item is: NOBITS
Weight: 2, Value: 18000, Worn in: TAKE FINGER
AC-apply is -0.4
Can affect you as:
Affects: SPELL_BONUS by -15
Affects: MOVE by -10
Only those who are at least experienced warriors or monks may use this
item.