In "One Piece," Blackbeard, also known as Marshall D. Teach, is a unique character because he possesses two Devil Fruits. This is highly unusual since the general rule in the series is that a person can only hold the power of one Devil Fruit due to the lethal consequences that occur when trying to consume a second one.
Blackbeard's powers come from:
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Yami Yami no Mi (Dark-Dark Fruit): This is a Logia-type Devil Fruit that grants him the ability to create and control darkness. He can absorb attacks, create black holes, and manipulate shadows. The Yami Yami no Mi also allows him to nullify the powers of other Devil Fruit users, making it a formidable fruit.
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Gura Gura no Mi (Quake-Quake Fruit): This Paramecia-type Devil Fruit grants the user the ability to create powerful shockwaves and tremors that can cause massive destruction, including quakes that can affect the very foundations of the world. Blackbeard acquired this fruit after defeating Whitebeard and taking it for himself.
The specifics of how Blackbeard is able to wield two Devil Fruits have not been entirely explained within the manga or anime. However, it's heavily implied that his unique physiology allows him to do so. His body is described as being different from typical humans, leading to speculation and various theories among fans.
Ultimately, this aspect of Blackbeard's character contributes to the mystery and intrigue surrounding him and sets him apart as one of the most formidable antagonists in "One Piece."