Nostramo

Nostramo was the planet on which Konrad Curze, the Primarch of the Night Lords Legion, was discovered by the Emperor during the Great Crusade. Nostramo was a dark, bleak hive world covered in clouds of pollution. It had 5 major hive cities, Nostramo Prime to Nostramo Quintus, each city independent of the next. Due to an abnormal orbit of its moon, Tenebor, Nostramo experienced the equivalent of a Terran night even during the high point of the Nostraman summer. The Nostraman population was almost completely human, but they had adapted to their world's environment and now possessed no irises, their eyes consisting entirely of black pupils. Their skin was pale and there was an acute form of albinism in the population. Nostramo's geology contained priceless wealth. It had a huge quantity of naturally-occurring adamantium in its planetary crust. This meant Nostramo was a center for trade and was made wealthy through its commerce in strategic metals with other planets in the days before the Great Crusade reunited humanity. Because of the endless night on Nostramo, the world's suicide rate and number of murders were frighteningly high. The world's primary industry was the mining and refining of the strategic metal known as adamantium, though the vast majority of Nostramo's citizens lived in abject poverty, preyed upon by rampant criminal gangs and a corrupt governing aristocracy. Unlike the other Primarchs, Curze was never adopted by another family, and was forced to fend for himself in the terrible underhive of the planet's largest hive city, Nostramo Quintus. With his enhanced body and mind, Night Haunter quickly established himself as a major power in the cities of Nostramo and thanks to countless atrocities commited by him against the world's criminal gangs and corrupt nobles, a semblance of law was eventually imposed upon first Nostramao Quintus and then the other hive cities, as Curze was eventually recognized as the planet's benevolent dictator. It is during this period that Konrad Curze earned the name "Night Haunter" for the vicious murders of literally hundreds, if not thousands, of Nostraman criminals and corrupt nobles.

Just before the Horus Heresy erupted, Curze returned to Nostramo with his Night Lords Legion, gifted to him by the Emperor when he had been found, and destroyed it utterly with orbital fire from his fleet because the world had reverted to its criminal ways during his long absences on the Great Crusade. This fulfilled his visions of seeing his planet being destroyed by beams of white light that erupted from the heavens. For this crime, Curze was recalled to Terra by the Emperor and reprimanded for his brutal tactics, punishments which drove the Night Haunter and Legion into the arms of the Warmaster Horus and the Ruinous Powers of Chaos.