"Tionjack" was a term used to describe the warships of the Honorable Union of Desevro & Tion during the Tionese War. They were described as copper-colored with red sigils on their conning towers, and were armed with incendiary weapons, dioxis flares, pressure bombs, and plasma cannons that could be used in orbital bombardments.

Three Tionjacks were involved in a raid on Okator VIII towards the end of the Tionese War, destroying virtually all the settlements and leaving only one known survivor.