void main()
{
    effect eVFX;

    // Get the creature who triggered this event.
    object oPC = GetEnteringObject();

    // Only fire for (real) PCs.
    if ( !GetIsPC(oPC)  ||  GetIsDMPossessed(oPC) )
        return;

    // Only fire once.
    if ( GetLocalInt(GetModule(), "DO_ONCE__" + GetTag(OBJECT_SELF)) )
        return;
    SetLocalInt(GetModule(), "DO_ONCE__" + GetTag(OBJECT_SELF), TRUE);

    object oSelf = OBJECT_SELF;

    //effect eVFX;
    // Apply a visual effect.
    eVFX = EffectVisualEffect(VFX_COM_CHUNK_STONE_MEDIUM);
    ApplyEffectToObject(DURATION_TYPE_INSTANT, eVFX, oPC);

    // Have text appear over the PC's head.
    FloatingTextStringOnCreature("Cave-In!", oPC);

if (!GetIsPC(oPC))return;
int DoOnce = GetLocalInt(OBJECT_SELF,GetTag(OBJECT_SELF));
if (DoOnce==TRUE)return;
SetLocalInt(OBJECT_SELF,GetTag(OBJECT_SELF),TRUE);
ApplyEffectToObject(DURATION_TYPE_INSTANT,EffectVisualEffect(VFX_FNF_SCREEN_SHAKE),oPC);
PlaySound("as_na_rockfallg2");
AssignCommand(oPC,ClearAllActions());
AssignCommand(oPC,ActionPlayAnimation(ANIMATION_LOOPING_DEAD_FRONT,1.0,999.0));

// Destroy an object (not fully effective until this script ends).
DelayCommand(3.0, DestroyObject(oSelf));

}