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Map Basic Data Planetary Image
Small cross.png
Name: Tyran Unknown.jpg
Segmentum: Ultima Segmentum
Sector: Unknown
System: Unknown
Population: N/A
Affiliation: Imperium
Class: Dead World, former Ocean World and Research Station
Tithe Grade: Aptus Non

Tyran is a dead world in the Ultima Segmentum. In 745.M41, it was the site of first contact between the Imperium and the Tyranids, and is the source of that alien race's name.[3]


Tyran was an unimportant Imperial-controlled Ocean World to the galactic south-east of Ultramar, in the Eastern Fringe, 60,000 light years from Terra. The planet was home to an Adeptus Mechanicus Explorator Base, Tyran Primus, that studied the unknown sectors at the edge of the galaxy,[1][2] and was manned by no more than a few hundred Explorators at a time,[4] governed by Magos Varnak of the the Cult Mechanicus.[6] Eighty percent of the planet's surface was composed of turbulent oceans, their depths populated by an array of sea life ranging from colossal krakens to minuscule cuttlefish.[6]

Alien invasion

In 745.M41, Tyran would become the first battleground between the Imperium of Man and the Tyranid swarm. Previously, the Explorators on Tyran had detected several nearby worlds whose atmosphere and biomass had mysteriously vanished; shortly after this, Tyran itself became the target of the ravenous alien race responsible.[5] The resulting invasion left the planet a barren dead world, later rediscovered by Inquisitor Kryptman.[4] The alien species received its name from the events.[1]

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