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|Population=Unknown
|Affiliation=Imperial
|Class=[[Dead worldWorld]], Former (former [[Agri World]] and [[Ice World]])
|Tithe Grade=Unknown
}}
==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 ice world. It was the turning point of the advance of [[Hive Fleet Leviathan]]. 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 bond with the trooper vowing to return should the world ever need his aid. A temple within the capital Erebus honours this along with the planets residents changing the name to include the [[Ultramarine]]'s name and the local [[Planetary Defence Force]] attempting to replicate the Ultramarine's [[Power armour]].
==Hive Fleet Leviathan==
In 999.M41, Tarsis Ultra was faced with the threat of the [[Tyranids]] after it was discovered that a tendril of [[Hive Fleet]] [[Leviathan]] was bound for the planet. The [[Ultramarines]] were sworn to honour the ancient oath pledged by the [[Primarch]], [[Roboute Guilliman]], to defend the people of Tarsis Ultra; thus Captain [[Uriel Ventris]] through the orders of [[Marneus Calgar]] enlisted the aid of a [[Company]] from an Ultramarines [[Second Founding Chapter]], the [[Mortifactors]], led by [[Chaplain]] [[Astador]]. Supporting the [[space marinesSpace Marines]] defending Tarsis Ultra were 10th Logres led by [[Colonel]] Octavius Rebalaq, the 933rd [[Death Korps of Krieg]] led by Colonel Trymon Stagler, and the [[PDF Regiments]] headed by Major Satria. [[Inquisitor Kryptman]] was also present to impart his extensive knowledge of the Tyranids to help the war effort. [[Fabricator Marshal]] Sebastian Montante proved to be a valuable asset as an efficient organiser of resources and general supply management.
When the Tyranids arrived in the system and consumed the planet Barbarus Prime, the Imperials launched an attack in space. Despite an initial victory in destroying a [[Hiveship]], Inquisitor Kryptman wished to invoke [[Exterminatus]] upon the world Chordelis, as it was the next planet in the path of the Tyranids; this was to prevent it from being devoured and swelling the Tyranids' numbers, as planetary evacuation was deemed to be too slow. Ventris was vehemently against this decision and supported an alternative solution proposed by Admiral Tiberius, who proposed to slow down the Tyranids by exploding a hydrogen-plasma refinery in space thereby destroying another Hiveship. However, Kryptman had lied to Ventris and with the assistance of the Mortifactors invoked Exterminatus in spite of the Ultramarines' plan succeeding. The Imperials attempted the same trick again with a second space refinery to destroy yet another Hiveship. However, the Tyranids adapted to this ploy and the plan backfired on the Imperials, crippling their fleet and forcing the survivors to flee; Tarsis Ultra was left unprotected from space, which allowed the Tyranids to launch their final planetary invasion.
However, despite the victory Tarsis Ultra would not be the same again; a few years after the invasion, the Tyranids had left some form of vegetation behind that was consuming the ecosystem (albeit slowly); this forced the Imperials to send fire-teams to suppress it.
A furious Warsmith Honsou, fresh from his narrow victory over the Warsmiths [[Berossus]] and [[Toramino]] as well as his defeat at the hands [[Uriel Ventris]], arrived at a Space Station and with his new warriors, slaughtered the crew and seized control of multiple torpedostorpedoes. A few bombarded cities, while the final one sped up the growth of the Tyranid plants, and killed the world. [[Magos Locard]] and a few members of the [[Skitarii]] land and attempt to investigate what happened. Magos Locard vows to make Honsou pay for his actions (though he does not know exactly who did this). <sup>2</sup>
==Sources==
