void main()
{
    object oPC = GetEnteringObject();
    object oGem = GetItemPossessedBy(oPC, "NK_FP_POLY");
    if (oGem == OBJECT_INVALID)
    {
        object oPentagram = GetNearestObjectByTag("NK_FP_PENTAGRAM", OBJECT_SELF, 1);
        SetLocalInt(oPC, "NK_FP_POLYME", 1);
        SignalEvent(oPentagram, EventUserDefined(1001));
    }
}