ItemPropertyArcaneSpellFailure

// 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