Remata'Klan served as Third under the Vorta Keevan. Their ship crashed on a planet inside a dark-matter nebula. Although both the First and Second were killed, Remata'Klan remained Third since he had previously questioned Keevan's orders to enter the nebula. Two days later, another Jem'Hadar attack ship crashed on the planet, carrying Captain Benjamin Sisko and his team. Keevan sent Remata'Klan to bring Sisko and Bashir to him after Garak and Nog were captured.
Remata'Klan was aware that Keevan was sending his unit into a deliberate ambush so that they would be killed by the Starfleet officers before the ketracel-white ran out. Before the battle, Sisko offered Remata'Klan the option to surrender, and to keep the Jem'Hadar sedated until new supplies of white were procured. Remata'Klan refused despite Keevan's betrayal, determined to follow "the order of things" that had been set down by the Founders. Remata'Klan and his unit were buried on the planet where they fell.