Marshall D. Teach, also known as Blackbeard, wields the powers of two Devil Fruits - the Yami Yami no Mi and the Gura Gura no Mi. The Yami Yami no Mi gives him the power of darkness, which can 'reduce anything to nothingness'. The Gura Gura no Mi, on the other hand, grants him the power to create earthquakes. Teach is the first and only known person to wield the powers of two Devil Fruits simultaneously, a feat attributed to his unique body structure.