Mechanical Spiders are small automatons created by Harumi as part of his Art of the Clockwork Devil. He uses them as a field-changer in conjunction with Wire Strings spooled out through the back of the spider, in a manner similar to webbing. Common strategy used with said automatons is to cast them across the battlefield, where they will crawl across the field, creating a web of razor wire that can surprise an opponent focused on Harumi.