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|Casualties2 =90% of the Thousand Sons Legion forces<br>billions of civilians and Prosperine Spireguard
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The '''Battle of Prospero''', also known as the '''Desolation of Prospero''' or '''Burning of Prospero''', is the name of the full-scale invasion and planetary devastation of [[Prospero]], [[Adeptus Astartes Homeworld|homeworld]] of the [[Thousand Sons]], by imperial [[Imperial]] forces that mainly included the [[Space Wolves]] [[Legiones Astartes|Legion]], the [[Adeptus Custodes]] and the [[Sisters of Silence]].{{Fn|1}}
== Prelude ==
At the [[Council of Nikea]] the [[Emperor]] had personally declared that the deployment of [[Librarians]] and the use of [[psychic powers]] by any and all members of the Legiones Astartes was from that point on forbidden. He further threatened that any who transgressed against this announcement would be declared his enemy and suffer extreme retributive punishment. This judgement rested heavily on the shoulders of the Thousand Sons [[Space Marine Legion]] and their [[Primarch]], [[Magnus the Red]], who not only possessed and advocated the use of psychic powers themselves, but had felt personally unfairly judged and rejected by the Emperor at the Council, perceiving the whole affair as more of a rigged "Trial of Magnus" than anything else.{{Fn|1a}}
