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From Warhammer 40k - Lexicanum
adding detail
|Commanders1 =[[Captain-General]] [[Constantin Valdor]]
|Commanders2 =[[Primarch]] [[Ushotan]] (KIA)<br>[[Grand Provost Marshal]] [[Uwoma Kandawire]]<br>[[Amar Astarte]] (KIA)
|Strength1 =~10,000 [[Dark Angels|1 1st Legion]] [[Space Marine]]s<br>Loyal [[Imperial Army]]<br>Handful of [[Custodes]]<br>[[Alpharius]] (allegedly){{Fn|2}}
|Strength2 =Surviving [[Thunder Warriors]]<br>Rebel [[Imperial Army]] including the [[Castellan Exemplars]]<br>Mercenaries
|Casualties1 =Light
The conspiracy was led by [[Grand Provost Marshal]] [[Uwoma Kandawire]], [[Thunder Warriors]] [[Primarch]] [[Ushotan]], and [[Biotechnical Division]] head [[Amar Astarte]]. The conspirators intended to remove [[Constantin Valdor]] from power and put him on trial for the massacre of the Thunder Warriors at Mt. Ararat without consent of the [[High Lords of Terra]]. They did not intend to oust the Emperor, but rather intended to let him have the final judgement on Valdor's fate.{{Fn|1a}} However this was only the true goal of Kandawire. Amar Astarte had grown to believe the [[Primarch Project]] and raising of the [[Legiones Astartes]] doomed without the Primarch's available, while Ushotan simply sought revenge. The conspirators drew upon a variety of forces, from mercenaries to soldiers of fortune to [[Imperial Army]] units loyal to Kandwaire. At their core were Thunder Warriors under Ushotan and Amar Astarte's [[Castellan Exemplars]], genetically engineered to be loyal only to her.{{Fn|1b}}
With the still under construction [[Imperial Palace]] sparsely populated and the [[Emperor]] busy with other projects, the conspirators expected they would be able to topple the regime inside the complex and arrest Valdor. Initially they met with great success and swept aside minimal loyalist Army units with little effort. However inside the incomplete [[Great Chamber of the Senatorum Imperialis]] Ushotan, Kandawire, and his Thunder Warriors were confronted by a lone [[Custodian]] in the form of Constantin Valdor. Valdor urged them to surrender, and when the conspirators refused the [[Captain-General]] unleashed the [[Angels of Death]] in what would be their very first live combat engagement. 10,000 warriors of the [[Dark Angels|I Legion]], only recently out of training, emerged and used their superior teamwork and discipline to mow down the savage Thunder Warriors and Army units with their new [[Boltgun]] weapons.{{Fn|1c}} Allegedly, [[Alpharius]] was among these troops, disguised as a regular Space Marine.{{Fn|2}} Amid the carnage Valdor and Ushotan dueled, with the Captain-General eventually slaying the Thunder Warriors Primarch. Before Ushotan died, he expressed his regret that Valdor was numb to all emotion and humanity.{{Fn|1d}}
Meanwhile, Amar Astarte journeyed into the [[Imperial Dungeon]] to destroy her lab and end the [[Legiones Astartes]] project forever. She was confronted by the Custodian [[Samonas]], but the warrior was unable to prevent her from causing a catastrophic explosion that engulfed both the lab and herself. Samonas survived, but all of the genetic lore on the Primarchs was apparently lost. In truth, the Emperor had foreseen Astarte's treachery and had made backup copies of her data and samples and hidden them away elsewhere.{{Fn|1e}}
**{{Endn|1e}}: Chapter 14
**{{Endn|1f}}: Chapter 17
*{{Endn|2}}: [[Alpharius: Head of the Hydra (Novel)]], ''The Captain-General''
[[Category:Battles (Adeptus Custodes)]]
[[Category:Battles (Space Marines)]]
