I've been looking to create a similar item as an enchanted item.
A sword that allows the wielder to use weapons skill to parry magical attacks, grants a +2 to the roll, and would be usable 5 times per session.
My calculations are: 1 slot for the spell parry ability, 1 slot for +2 to that ability, and 2 slots for 4 additional uses per session..

Is this a legitimate use of the enchanted items rules? Or should this kind of effect be limited to the "Item of Power"?