The IKS Toh'Kaht was a Klingon Vor'cha-class cruiser that exploded on returning through the Bajoran wormhole in 2369 after its crew, influenced by a Saltah'na telepathic archive, turned on one another.
The Toh'Kaht appears in the Deep Space Nine episode Dramatis Personae. It had been sent on a survey mission to the Gamma Quadrant and returns through the wormhole a month early, only to blow up moments later.
Its first officer, Hon'Tihl, beams to the station mortally wounded and dies after speaking of victory. From his journal the station's officers learn that the Klingons found a set of energy spheres left by the extinct Saltah'na, which held a telepathic record of the power struggle that destroyed that people. The crew began to act out the conflict and killed each other.
The same influence then takes hold of the senior staff of Deep Space Nine, setting Kira against Sisko, until Odo drives it out.