In the Dominion War of the 2370s, the Vor'nak was among the Klingon vessels that helped defend Federation starbase Deep Space 9 from Dominion attack in 2374, at the Second Battle of Deep Space 9. (Decipher RPG module: Starships)
In 2374, Vor'nak transferred five crew members to the IKS Rotarran, including Alexander Rozhenko, N'Garen, daughter of Tse'Dek, Koth, son of Larna, Katogh, son of Ch'Pok and Doran, daughter of W'mar. (DS9 episode: "Sons and Daughters", DS9 - The Dominion War novelization: Call to Arms...)
- Although most other Vor'cha-class starships are referred to as attack cruisers in canon, the Vor'nak and other Vor'cha-class vessels are listed by the Decipher RPG as battle cruisers. It is not clear if this is because they are outfitted differently or if the two cruiser terms had become somewhat synonymous.