Deathshead

The Deathshead was a Xyston II-class Star Destroyer of the Coalition of the Red Star that was the first of the new ships to launch from the Moon. It was originally created to enforce law and order throughout the Coalition with the threat of mass destruction and was infamously used to destroy Yavin 4, a moon that once hosted the headquarters of the Alliance to Restore the Republic.

History
"Send the Deathshead to a world they know. Let it burn."

―Victor Nevarez gives the order for Yavin 4 to be annihilated

The Deathshead was the only Star Destroyer of its class that was unofficially part of the Immortal Armada. On the orders of Victor, the Deathshead was the only starship to launch from the Moon while the remainder of the armada was stationed on Exegol, their numbers are too expansive to all leave the planet simultaneously without being guided out by a navigational beacon.

Nevarez later ordered Lord Commander Reginar Albrecht to choose a planet with connections to the Grand Alliance to destroy as a show of force and a warning. The frigid world of Yavin 4 was chosen, and the Deathshead used its upgraded axial superlaser to obliterate the entire moon. After this, the Star Destroyer fled to Exegol to join the invasion fleet. As the armada prepared to exit the planet and invade all worlds, the Grand Alliance, along with the Future Alliance, the Earth Defense Fleet, and eventually the Free Worlds Fleet, came and destroyed nearly all of the starships, including the Deathshead and its crew.