|This article is about the planet; for the Ork empire, see Ork Empire of Octarius.|
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Depending on the source, it is also referred to as Octaria  or Octavius . It is a mountain world that has a single mega-continent with large snowy peaks. The shanty capital of the planet's ruler, Overfiend of Octarius is known as Gargates.
After the nearby Ork World of Orrok was consumed by Leviathan, the Overfiend of Octarius marshalled the tribes and prepared defences on Octarius. When the first wave of Mycetic Spores arrived days later, a great cheer went up from the gathered Ork hordes who were itching for a great fight. Much of the battle took place in the skies and so much ammunition was fired into the air by Ork Quad-guns and Flakka-Dakka Guns that the rain was thickened by chunks of falling Tyranid flesh. Then from the west the black storm clouds drew closer and closer until they were revealed to be swarms of advancing Gargoyles. Ork Deffkoptas, Fighta-Bommers and Stormboyz roared into the air in a race to intercept the oncoming creatures. Dead Orks, burning wreckage, and hissing Tyranid ichor rained down everywhere.
The Ork Boyz on the ground below began to climb the slopes, holding their Choppas high and intending to jump into the fray if only they could. Then suddenly the ground burst up and Genestealer broods flowed out of the tunnels. But the responding green tide of Orks quickly pushed them back into the crevasses and then plunged in after them. Meanwhile, Lictors scaled the mountainsides and stealthily silenced each Ork gun emplacement in turn. With the large guns down, the rain of Mycetic Spores doubled in ferocity and more and more Tyranids landed on the mountain passes to be met by equal numbers of Orks. Never before had Octarius seen such bloodshed, and the war soon spread from Octarius out to the entirety of the Octarius Sector.
- 1: Codex: Tyranids (5th Edition), pgs. 29–31
- 2: Codex: Tyranids (4th Edition), pg. 21
- 3: Planetstrike, pgs. 57–59
- 4: Waaagh! Ghazghkull - A Codex: Orks Supplement (7th Edition), The Octarian War