The IKS M'Char was a B'rel-class Klingon starship in service in the 24th century.
In 2372, the M'Char was part of the Klingon invasion fleet during the Klingon-Cardassian War. Under Commander Kaybok, the M'Char was detailed with searching civilian ships in the combat theatre (including Bajoran space) for possible changeling infiltrators.
The M'Char followed the SS Xhosa from Deep Space 9. Twelve Klingons were killed when the Xhosa went to warp just as they were beaming over. (DS9 novelization: The Way of the Warrior)
By the time it finally stopped the Xhosa, the USS Defiant intervened. Kaybok relented, but was subsequently executed for disobeying orders. (DS9 episode: "The Way of the Warrior")
Martok, Paghal and several other fleet commanders had beamed aboard the M'Char. Kaybok was killed there by Paghal, who he had served with previously. (DS9 novelization: The Way of the Warrior)