The "Sword of Logos" is a powerful weapon featured in the Kamen Rider series, specifically in Kamen Rider Saber. It serves as a primary tool for the protagonist, allowing him to transform and access various abilities. The sword is often associated with the theme of storytelling, as it draws power from different books that represent various tales and characters. In the series, the Sword of Logos is not just a weapon but also a symbol of knowledge and imagination. It enables the user to harness the power of mythical creatures and legendary heroes, making it a central element in the battle against evil forces.