There is a new threat in Ninjago, and he goes by the name of Ronin. With help from his army of dark samurai, Ronin steals the Ninjas' memories using an ancient weapon called the Obsidian Gla... Read allThere is a new threat in Ninjago, and he goes by the name of Ronin. With help from his army of dark samurai, Ronin steals the Ninjas' memories using an ancient weapon called the Obsidian Glaive.There is a new threat in Ninjago, and he goes by the name of Ronin. With help from his army of dark samurai, Ronin steals the Ninjas' memories using an ancient weapon called the Obsidian Glaive.