Baal
Baal is a Death World famous for being the home of the Blood Angels, the most badass vampires in history.
The Blood Angels Primarch Sanguinius, fell upon Baal Secundus after he and his brother Primarchs were scattered across the galaxy by the machinations of the Chaos Gods.
Baal has two moons are called Baal Primus and Baal Secundus, Apparently the moons were damn close to paradise worlds, but the The Age of Strife slightly altered that. The moons' populations now spend their time evolving out of the stone age.
Oh and the Tyranids are coming to eat it.