void main()
{
object oPC = GetEnteringObject();
effect eFail = SupernaturalEffect(EffectSpellFailure());
effect eVis = EffectVisualEffect(VFX_IMP_KNOCK);

ApplyEffectToObject(DURATION_TYPE_PERMANENT,eFail, oPC);
ApplyEffectToObject(DURATION_TYPE_INSTANT,eVis, oPC);
AssignCommand(oPC, PlaySound("sce_negative"));

effect eEffect = GetFirstEffect(oPC);
   while(GetIsEffectValid(eEffect))
   {
   if (GetEffectType(eEffect)== EFFECT_TYPE_ABILITY_INCREASE ||
       GetEffectType(eEffect)== EFFECT_TYPE_AC_INCREASE ||
       GetEffectType(eEffect)== EFFECT_TYPE_DAMAGE_REDUCTION ||
       GetEffectType(eEffect)== EFFECT_TYPE_DAMAGE_RESISTANCE ||
       GetEffectType(eEffect)== EFFECT_TYPE_ELEMENTALSHIELD ||
       GetEffectType(eEffect)== EFFECT_TYPE_HASTE ||
       GetEffectType(eEffect)== EFFECT_TYPE_SAVING_THROW_INCREASE ||
       GetEffectType(eEffect)== EFFECT_TYPE_SEEINVISIBLE ||
       GetEffectType(eEffect)== EFFECT_TYPE_SKILL_INCREASE ||
       GetEffectType(eEffect)== EFFECT_TYPE_SPELL_IMMUNITY ||
       GetEffectType(eEffect)== EFFECT_TYPE_IMPROVEDINVISIBILITY ||
       GetEffectType(eEffect)== EFFECT_TYPE_INVISIBILITY ||
       GetEffectType(eEffect)== EFFECT_TYPE_SPELL_RESISTANCE_INCREASE ||
       GetEffectType(eEffect)== EFFECT_TYPE_SPELLLEVELABSORPTION ||
       GetEffectType(eEffect)== EFFECT_TYPE_TEMPORARY_HITPOINTS ||
       GetEffectType(eEffect)== EFFECT_TYPE_TRUESEEING ||
       GetEffectType(eEffect)== EFFECT_TYPE_POLYMORPH ||
       GetEffectType(eEffect)== EFFECT_TYPE_IMMUNITY ||
       GetEffectType(eEffect)== EFFECT_TYPE_DAMAGE_IMMUNITY_INCREASE)

    {
    RemoveEffect(oPC, eEffect);
    }
   eEffect = GetNextEffect(oPC);
   }
}