A large Klingon warship with a blade-like prow built to ram, one of which decloaked and sliced into the Starfleet flagship Europa at the Battle of the Binary Stars.
The cleave ship appears in the Discovery episode Battle at the Binary Stars. It is one of the vessels answering T'Kuvma's call, and like his own flagship it carries a cloaking device, something Starfleet has not yet met in Klingon hands.
When Admiral Anderson arrives in the USS Europa and tries to negotiate, T'Kuvma pretends to listen. The cleave ship then appears out of nowhere directly ahead of the Europa and drives its prow through the saucer. With his ship torn open, Anderson triggers a self-destruct that destroys both vessels. T'Kuvma presents the strike as proof of Starfleet's false talk of peace, and the battle becomes the opening of the war.