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{{UltramarinesPortalGalaxyPortal}}{{GalaxyPortalcite}}'''Tarsis Ultra''' is a [[Dead World]] and former [[Agri World]] in the realm of [[Ultramar]]. ==Planetary Summary==

|System=[[Tarsis Ultra System]]^{{Fn|1a}}

==Background=='''Tarsis Ultra''' was a Civilised World with some specifications typical to an [[Agri World]] and a long, harsh winter period during which it looked like a ice world. It was the turning point of the advance of [[Hive Fleet LeviathanIce World]].  During the [[Great Crusade]], [[Roboute Guilliman]] led the assault on this world from which he was attacked by an unknown assailant but was saved by a native soldier. Guilliman then made a warriors warrior's bond with the trooper , vowing to return should the world ever need his aid. A temple within the capital city, Erebus , honours this along with oath, which was also marked by the planets residents planet's inhabitants changing the its name to include the [[Ultramarine]]'s name and the local [[Planetary Defence Force]] attempting to replicate the Ultramarine's [[Power armour]]word "Ultra."

In 999.M41, Tarsis Ultra was faced with the threat of the [[Tyranids]] after it was discovered that threatened when a tendril of [[Hive Fleet]] [[Leviathan]] was bound for turned towards the planet. The [[Ultramarines]] were sworn to honour the ancient oath pledged by the ' 4th [[PrimarchCompany]], under [[Roboute GuillimanSpace Marine Captain|Captain]], to defend the people of Tarsis Ultra; thus Captain [[Uriel Ventris]] through , were dispatched to defend the orders of [[Marneus Calgar]] enlisted planet, enlisting the aid of a [[Company]] from an one of the Ultramarines ' [[Second Founding|Second Founding Successor Chapter]]s, the [[Mortifactors]], led by [[Chaplain]] [[Astador]].  Supporting the [[Space Marines]] defending Tarsis Ultra were two [[Imperial Guard]] [[regimentRegiment]]s, the [[10th Logres]] led by [[Colonel]] [[Octavius Rabelaq]] and the 933rd [[Death Korps of Krieg]] led by Colonel [[Trymon Stagler]], plus the [[PDF]] headed by Major [[Aries Satria]]. [[Inquisitor Lord]] [[Kryptman]] was also present with a [[Deathwatch]] [[Kill-team]] to impart his extensive knowledge of the Tyranids to help the war effort. [[Tech-priestGovernor|Fabricator Marshal]] [[Sebastien Montante]] proved to be a valuable asset as an efficient organiser of resources and general supply management.

However, despite the victory Tarsis Ultra would not be the same again. Despite their defeat, the Tyranids had left behind a form of vegetation (likely [[Capillary Tower]]s) that was consuming the ecosystem (albeit slowly), which forced the Imperials to implement a slash-and-burn policy in an attempt to suppress it.^{{Fn|2}}

A few years after the victory on Tarsis Ultra, a furious [[Iron Warriors]] [[Warsmith]] [[Honsou]], fresh from his narrow victory over rival Warsmiths [[Berossus]] and [[Toramino]], as well as his defeat at the hands of [[Uriel Ventris]], learned of Tarsis Ultra through [[The Newborn]], a mutated clone of Ventris who had inherited all of the Ultramarine's memories. Determined to destroy everything Ventris held dear, Honsou raided an Imperial agro-research facility and stole a sample of the experimental [[Heraclitus]] virus.^{{{Fn|2, }}{{Fn|3}}}

By utilizing Ventris' s memories from the Newborn's subconscious, Honsou was able to infiltrate to the inner system and board one of Tarsis Ultra's space stations with his followers, where he slaughtered the crew and launched orbital torpedoes at the surface. A few of the torpedoes bombarded cities, but the final one carried the Heraclitus virus. The virus was designed to speed up crop growth, but it had a cataclysmic reaction with the Tyranid vegetation, speeding up its growth so quickly that it covered the entire planet and eventually consumed the atmosphere^{{Fn|3}}, leaving the planet an airless and sun-scoured rock.^{{Fn|2}}

After Honsou departed, [[Magos]] [[Locard]] and a few members of the [[Skitarii]] landed and attempted to investigate what had happened. Locard vowed to make whoever was responsible for the death of Tarsis Ultra pay.^{{Fn|2}}

*^{{Endn|1}}: [[Warriors of Ultramar (Novel)]] - [[Ultramarines (Novel Series): The Omnibus]] Omnibus by [[Graham McNeill]]: **a{{Endn|1a}}: Ch 4Chapter Four, pppgs. 324-325*^{{Endn|2}}: ''[[The Heraclitus Effect (Short Story)]]'' by [['''Graham McNeill]]'''*^{{Endn|3}}: [[The Chapter's Due (Novel)]] by [[Graham McNeill]], {{Cite This}}