Kind of a pity that Games Workshop only makes one model that represents both a static and activated blackstone fortress, since I think the fact that they start out as a big armored shell and then open up to reveal armageddon guns is kind of awesome.<br/><br/>I wouldn't deny that there could be a blackstone fortress in the Mextil cluster, though.  En seems to imply that the weapon dates from the War in Heaven, a semi-mythical time millions of years before the present day in which the Necrons first appeared and nearly destroyed all life in the galaxy.  The Eldar and Orks both claim to be survivors of this period,<br/><br/>If you ever run into a ridicoulosly gigantic fleet of Chaos ships led by a planet destroyer, I'd suggest you roll to disbelieve