The Yami Yami no Mi in use by Blackbeard. The first and foremost strength, as demonstrated by Blackbeard, is that it allows the user to control darkness and its unique property of gravity. The darkness is visually demonstrated by a black smoke-like substance spreading out from the user's body.

It originally belonged to Genei, 1st and original Commander of Whitebeard Pirates' 2nd division, but was stolen and eaten by Marshall D. Teach, also known as Blackbeard.

The Yami Yami no Mi is a Logia-type Devil Fruit that allows the user to create and control darkness at will, making the user a Darkness Human (闇人間, Yami Ningen^?).

However, for unknown reasons, Blackbeard is the only character with the powers of two devil fruits. Blackbeard's devil fruits are both Logia and Paramecia-type, but they are strong enough to destroy entire islands. Here are the details of Blackbeard's devil fruits and the techniques they grant to their user.