Castor Monitor

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The Castor is a class of monitor constructed by the Post-Human Republic. Similarly to its UCM counterpart - the Istanbul - the Castor features heavy-calibre mass drivers on a rotating mount that let it fire between orbital layers. Interestingly, the Castor also uses a vertically-oriented superstructure that is atypical for the majority of PHR vessels. Given the similar appearances of the Pompeius and Agrippa battlecruisers, this could indicate a shift in hull construction from the PHR, or that the Castor was a test bed for the technology that would eventually go into the Pompeius.

Very few Castors have been seen in action, as the Republic has primarily been on the offense and therefore has had little to no territory that would require a naval monitor to defend. Those that the UCMF have encountered were either sighted over the PHR's permanent base on the Tlalocan Moons, or over PHR landing sights on Earth. The latter is particularly concerning, as it indicates that the PHR are confident in their prediction that the battle for humanity's homeworld will be a longer haul than the UCM wanted.