ISD 15797 - Battle of Second Cressgard

Following a crushing defeat at the First Battle of Cressgard in ISD 15792, the Imperial Legions, led by LORD CASSIAN POWERS, returned to Cressgard to reclaim the planet. This victory afforded the Empire the first Cielcin worldship ever captured and impounded for study— the Echidna. The dwarf planet was converted into a starship by the Cielcin Prince ZAHAMARA*. Archaeological digs found the bones of a Watcher amongst the Vaiartu writing and graven images.

* Ashes of Man's Index of Worlds in the original text lists the Echidna as having been settled by the Cielcin Prince Laramnaina.

“But it is most unlike the Cielcin to waste resources, Lord Strategos. The first siege at Cressgard took years. The Cielcin were still chasing people out of caves in the mountains when Cassian Powers arrived five years in.”

Demon in White, Chpater 72: Between the Hammer and the Anvil

Although a larger ship’s warp engine would warp space more efficiently once it fired, it was well known that the larger the vessel, the slower the jump to warp. The Cielcin worldships were notoriously slow to jump. It made catching them in a rout more possible. That was how Cassian Powers himself had caught the vessel-moon called Echidna at Second Cressgard, crippling her engines before she could jump to warp.

Disquiet Gods, Chapter 52: A New Order

Battle of Echidna

“But it was long gone by the time I arrived. There was still fighting, though. The Cielcin were dug in deep. They had tunnel cities all over the worldship, some miles deep. We were years rooting them out. Killed them to the last, like we was ordered. We heard stories there was some captured and shipped to some reservation somewhere for study—I never learned anything real about that, but . . . we just killed them.” Valen swallowed.

Tales of the Sun Eater, Volume 3 - Mother of Monsters