1) Create enchantment instance 2) Add it to item 3) Put item into the chest PHP: $item = Item::get(Item::STONE_SWORD);$id = Enchantment::SHARPNESS;$level = 2;$instance = new EnchantmentInstance(Enchantment::getEnchantment($id), $level);$item->addEnchantment($instance);$pos = new Vector3(4, 5, 1); //chest position/** @var \pocketmine\level\Level $level */$tile = $level->getTile($pos);if ($tile instanceof Chest) { $tile->getInventory()->addItem($item);}