// Creates an item property that offsets the effect on arcane spell failure
// that a particular item has. Parameters come from the ITEM_PROP_ASF_* group.
itemproperty ItemPropertyArcaneSpellFailure(int nModLevel);

Note: The description for this is incorrect. Parameters come from IP_CONST_ARCANE_SPELL_FAILURE_* and not ITEM_PROP_ASF_* as the description states

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