ItemPropertySpellImmunitySchool

From NWN2Wiki

// Returns Item property spell immunity vs. spell school.  You must specify the 
// school to which the user will be immune(IP_CONST_SPELLSCHOOL_*).
itemproperty ItemPropertySpellImmunitySchool(int nSchool);

Note: It is not clear why the values for IP_CONST_SPELLSCHOOL_* are not aligned with SPELL_SCHOOL_* for those saves which are common to both