Use MobArmorEquipmentPacket. PHP: /** @var Zombie $zombie */$pk = new MobArmorEquipmentPacket();$pk->eid = $zombie->getId();$helmet = new ItemItem(ItemItem::DIAMOND_HELMET);$pk->slots = [$helmet];foreach($zombie->getViewers() as $viewer){ if($viewer instanceof Player){ $viewer->dataPacket($pk); }} I highly recommend you overwrite Zombie::spawnTo(). It'll be better... PHP: public function spawnTo(Player $player){ parent::spawnTo($player); $player->dataPacket($pk);}