The Ampoliros

[Nightfall]

She is like the Ghost Ship she was named after.
She is unseen until she appears majestic in your sensor range, but if you're an enemy - it will be too late when you see her, her missile batteries will fire their salvos and pulverise you.

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If the stars should appear one night in a thousand years, how would men believe and adore and preserve for many generations the remembrance of the city of God? - from 'Nightfall' by I. Asimov
The Outcasts consider Siniestre Nube a sacred place for several reasons. Early explorers discovered a jumphole within the depths of the cloud that leads to a strange world of ringed stars and strange craft. All ships in the burrial ground are placed facing that hole to honor the Alien Spirits. - An Outcast rumor