ItemPropertyImmunityToSpellLevel

From NWN2Wiki

// Returns Item property immunity to spell level.  You must specify the level of
// which that and below the user will be immune.  The level must be an integer
// between 1 and 9.  By putting in a 3 it will mean the user is immune to all
// 3rd level and lower spells.
itemproperty ItemPropertyImmunityToSpellLevel(int nLevel);