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In 2388, as part of Project Looking Glass, Martok took the Heart of Kahless and a Klingon fleet into the mirror universe and fight towards Bajor, planning to cross back into the primary universe to engage the Grigari. However, the Grigari themselves transported to the mirror universe and destroyed the Heart of Kahless and the Klingon armada. (DS9 novel: The War of the Prophets)