The Hive Fleet Behemoth’s route was the first Tyranid path the Imperium ever saw, a straight, brutal push from the galactic south-east into Ultramar. It kicked off the First Tyrannic War and ended at Macragge, where the Ultramarines finally stopped it.
Where the route began
Behemoth entered the galaxy from the south-eastern edge of the Eastern Fringe, near the world of Tyran. It didn’t sneak. It came in fast and loud, ploughing through hundreds of systems and eating everything it touched.
The Imperium got warning signs before the fleet even arrived. Explorator census teams found worlds that had been full of life, reduced to bare rock with no bacteria left. Those dead worlds were reported, filed away, and mostly ignored.
Worlds along the way
Tyran was the first documented attack, in 745.M41. The Adeptus Mechanicus outpost there was overrun and stripped of all life. Inquisitor Kryptman later recovered a data-codex from deep under the base and realised what was coming.
From there the fleet pushed on through the Eastern Fringe. Occulus, a moon-sized observator station, got eaten along with its crew. Jagga, home to Ork Freebooters called the Star Krumpas, was next. Then came Thandros, Solemnace, Prandium, Sybari, and more, each one a step deeper into Imperial space.
The route wasn’t a clever campaign. Behemoth had no subtlety. It just charged forward, and that recklessness eventually cost it, because it burned through more biomass than it could replace.
- Tyran: first documented attack, Adeptus Mechanicus outpost destroyed
- Occulus: moon-sized observator station devoured with its crew
- Jagga: Ork Freebooters’ home, met by the Star Krumpas fleet
- Prandium: a garden world lost to the swarm
- Macragge: the final battle that broke the fleet
The end at Macragge
Behemoth’s route finished at Macragge in 745.M41 or 746.M41, depending on which source you trust. The Ultramarines and their allies held the line, and the fleet was destroyed.
The victory came at a cost. Behemoth had already eaten its way across Ultramar, and the Imperium’s defence was nearly broken before it was. Kryptman’s warnings had bought some time, but not enough to save every world in the path.
What came after
Behemoth didn’t vanish cleanly. Fragments of the fleet survived and drifted, and later Hive Fleets like Kraken and Leviathan would take very different approaches. Where Behemoth was a straight charge, those later fleets were more patient and more strategic.
The route matters because it set the template. It was the Imperium’s first look at the Tyranids as a species, and it showed them that something out there was hungry enough to strip whole worlds bare.
Key facts
- Behemoth was the first Tyranid Hive Fleet the Imperium encountered.
- Its route started near Tyran in the Eastern Fringe and ended at Macragge.
- The fleet devoured hundreds of systems with no subtlety or strategy.
- Inquisitor Kryptman recovered a data-codex from Tyran that revealed the threat.
- Behemoth was destroyed at Macragge in 745.M41 or 746.M41, depending on the source.
- Fragments of the fleet survived and later Hive Fleets took different approaches.
FAQ
What was the Hive Fleet Behemoth’s route?
It ran from the galactic south-east of the Eastern Fringe, starting near Tyran, and pushed through Ultramar until it reached Macragge. Along the way it devoured Occulus, Jagga, Prandium, and many other worlds.
When did Hive Fleet Behemoth invade?
The first documented attack was on Tyran in 745.M41. The fleet was destroyed at the Battle for Macragge in 745.M41 or 746.M41, depending on the source.
Why did Behemoth’s route matter?
It was the Imperium’s first contact with the Tyranids and triggered the First Tyrannic War. It also showed how fast a Hive Fleet could strip worlds of all life.