|Map||Basic Data||Planetary Image|
|Class:||Dead World, former Ocean World and Research Station|
|Tithe Grade:||Aptus Non|
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, and was manned by no more than a few hundred Explorators at a time, governed by Magos Varnak of the the Cult Mechanicus. 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.
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. The resulting invasion left the planet a barren dead world, later rediscovered by Inquisitor Kryptman. The alien species received its name from the events.
- 1: Codex: Tyranids (5th Edition), pgs. 8–9
- 2: Codex: Tyranids (4th Edition), pgs. 6–8
- 3: Planetstrike, pg. 54
- 4: Codex Imperialis (Background Book), pg. 90
- 5: Codex: Tyranids (3rd Edition), pg. 48
- 6: Codex: Tyranids (2nd Edition), pg. 5