A thread to collect snippets of background regarding planets and significant areas during the Great Crusade and Horus Heresy.

Great Crusade era

Charadon
* Capital planet(?) of ancient Ork Empire, ruled by mysterious Arch-Arsonist.

Damnos
* Planet in Ultima Segmentum. Was first populated during the Great Crusade.
* Mining World, but for even longer, it was a Tomb World.

Davin
* Planet made compliant early in Great Crusade.
* Inhabitants of Davin's moon origin of Luna Wolves warrior lodges.
* Horus brought here after injury by Interex anatheme.

Isstvan III
* Planet made compliant.
* Vardus Praal set up as Planetary Governor.

Laeran
* AKA Twenty-Eight Three
* Homeworld of the Laer Xenos
* Site of battle between Emperor's Children and Laer.

Nurth
* Planet made compliant by Alpha Legion and Geno troops of 670th Expedition Fleet.
* Low-tech, largely desert planet
* Subsequently destroyed by Chaos Black Cube.

Tesstra Prime
* Planet made compliant by Alpha Legion during Great Crusade. Alpharius received criticism from Guilliman due to delay in attacking.
* Inhabitants advanced and 'well-equipped', numbering 'well over a million soldiers'.
* Nature/Species of inhabitants not clear.

Ullanor
* Ullanor Crusade was site of Imperial victory over 'the largest horde of Orks ever encountered at that time'.
* Emperor's final battle before retiring to Terra.
* Emperor saved by Horus cutting arm from warboss while it choked him.
* Luna Wolves named Sons of Horus after this battle.

Urisarach
* AKA 'One-Forty-Twenty' and 'Murder'
* Inhabited by exiled Megarachnid.


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Early Horus Heresy
Calth
* Planet in Realm of Ultramar.
* Site of battle between Ultramarines Expeditionary Force and majority of Word Bearers Legion (remainder stationed in Sol System) supported by Dark Mechanicus.
* Sun bombarded by Word Bearers. Subsequent alterations in radiation strip Calth's atmosphere.
* Word Bearers defeated.

Chondax system
* Site of space Fleet battle between Loyalists (Space Woves, White Scars) and Rebels (Alpha Legion).
* White Scars forces stationed here immediately before Siege of Terra – near Terra? (spec.)
* Loyalists escape.
* Post-Burning of Prospero.

Eastern Fringe
* Region of Galaxy.
* Dark Angels attacked by Night Lords.

Gugann
* Planet made compliant by Iron Warriors.
* During pacification, Olympia, the Iron Warrior's homeworld, broke out into open rebellion.

Isstvan III
* Planet: Planetary Governor, Vardus Praal, declared his independence from the Imperium, and practiced forbidden sorcery.
* Capital is Choral City.
* Human inhabitants rebelled against Imperial rule.
* World Eaters, Sons of Horus, Emperor's Children, Death Guard present.
* Loyalist elements of legions, and inhabitants, virus-bombed.
* Frigate Eisenstein escapes, carrying loyalists including Captain Garro of the Death Guard and Iacton Qruze of the Luna Wolves to Luna.
* Renegade human team?

Isstvan V
* Planet: site of Dropsite Massacre.
* Rebel headquarters.
* Battle between Loyalists (Iron Hands, Salamanders and Raven Guard) and Rebels (World Eaters, Sons of Horus, Emperor's Children, Death Guard, Night Lords, Alpha Legion and Iron Warriors.)
* Rebel victory.
* Loyalist Legions devastated.
* Subsequently site of space Fleet battle between Iron Warriors and majority of Imperial Fists armada. Imperial Fist victory.

Mars
* First and Greatest Forgeworld.
* Site of Mechanicus civil war:
* Imperial Fist veterans and loyalist Mechanicus vs renegade dark mechanicus.

Prospero
* Thousand Sons homeworld.
* Site of battle between Space Wolves and Thousand Sons. Space Wolves victorious.
* Capital is Tizca, the City of Light.

Signis Cluster
* Daemon-infested system.
* Blood Angels sent here by Horus.
* Sanguinius defeated by Khornate Daemon Ka'bandah.
* Blood Angels emerge victorious.

Tallarn
* Temperate world virus-bombed by Iron Warriors.
* Site of battle between Iron Warriors and Imperial Army.
* Largest tank battle of the Horus Heresy.
* Eldar have interest in mysterious 'Ring' beneath surface.

Late Horus Heresy/Scouring
Ancient Terra
* Human homeworld. Duh! :P
* Site of battle between Loyalists (Imperial Army, White Scars, Blood Angels, Imperial Fists and Mechanicum) and Rebels (Luna Wolves, World Eaters, Word Bearers, Iron Warriors, Thousand Sons, Death Guard, Emperor's Children, Dark Mechanicus, Daemons, cultists, renegade Army units.)
* Notable locations: Eternity Wall spaceport, Eternity Gate, Lion's Gate spaceport (site of battle between Loyalist tank divisions, White Scars and Rebels), Sanctum Imperialis, Throneroom.

Caliban
* Planet: site of Dark Angel Civil War.
* Death of Jonson. Subsequently shattered into ruins.

Eskrador
* Planet where Alpha Legion and Ultramarines clashed.
* Alpharius apparantly killed, but Ultramarines driven off after two weeks further fighting.

Tsagualsa
* Planet where Callidus assassin M'Shen killed Konrad Curze, the Night Haunter.

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A template for people to use for further entries. Remove the space after each '[' to complete.
[ b]NAME[ /b]
[ i]* [TYPE OF AREA: Planet/system/area?]
* [FURTHER INFO]
* [FURTHER INFO]
* [FURTHER INFO][ /i]

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Please feel free to add additional info.

Excellent list Apologist. I do have a few amendments and corrections for the entry for Ullanor.

It was actually on Gorro rather than Ullanor that the Emperor was throttled by an Ork Warlord:

Also the Luna Wolves did not change their name to the Sons of Horus after the battle. The honour was offered by the Emperor at Ullanor but declined by Horus. It was not untill later,just prior to leaving for the Davin System, that it was adopted and proclaimed by Horus (Horus Rising, Page 411-412).

Excellent list, I just want to know the background sources of this one-

I love the Iron Warriors and any details on how to find more about this interesting topic would be appreciated.

From memory (sorry!) the best source for the tank battle reference is the second edition Codex: Imperial Guard, though there are hints in Adeptus Titanicus and first edition Space Marine, I believe. I wouldn't get your hopes up, mind – I'm fairly sure it's simply a one line entry in each case, saying 'largest tank battle of the Horus Heresy'.

The 'ring' the eldar are interested in was referenced in a battle report (possibly short story?) in WD – I think around the 185–195 mark, when the Tallarn models were released.

Mem-wafers are failing, so can anyone provide a more complete explanation?

There was a series of 'Famous Regiments of the Imperial Guard' articles published in White Dwarf when the metal squads for the various regiments were released. They used to be on the old GW Website but are one of the (many :angry: ) articles that have not made it on to the new one. The gist was that the Iron Warriors attacked the planet during the Heresy, first virus-bombing the planet (Tallarn used to be a lush temperate world before this). Due to the residual toxins, the battle for the planet developed into purely a tank battle as the toxic environment was too hazardous to infantry. The IW were eventually fought off after massive losses on both sides, although the reason for their interest in the planet was not discovered until much later.

Many millennia later Tallarn miners discovered a massive mysterious structure underground. They were midway through continuing to uncover it when the Eldar attacked the planet - the structure was an ancient summoning circle known as the Cursus that when activated fully would turn the planet into a daemonworld. The Eldar suspected the Tallarn had been corrupted by Chaos, but when they discovered the truth the two joined forces to combat the waves of daemons that were now emerging from the Cursus. Eventually the Eldar/human alliance managed to defeat the forces of Chaos and the Eldar sealed the Cursus for all time, swearing eternal freindship with the men of Tallarn before departing.