This is a basic OnPerceived script which will check for an item and make the NPC hostile if the PC does not have it equipped: // Goes in the OnPercieved of an NPC // Checks a PC has the correct item equipped in a specific inventory slot void main() { object oPC = GetLastPerceived(); object oDisguise = GetObjectByTag("disguise"); // Insert the correct item tag if (GetIsPC(oPC)) { object oTarget = GetItemInSlot(INVENTORY_SLOT_CHEST, oPC); // Change the inventory slot as required if (oTarget != oDisguise) { // Uncomment the appropriate lines or add your own custom code // AdjustFactionReputation(oPC,OBJECT_SELF,-100);//This would make the NPC's whole faction hostile // SetIsTemporaryEnemy(oPC);//This is for just this NPC // ActionAttack(oPC);// Ensures the NPC will attack immediately } } }