From Lexicanum

The Prospero Spireguard were a regiment of soldiers of the Imperium that existed during the time of the Great Crusade.

Overview

This element of the Imperial Army worked under the Thousand Sons Adeptus Astartes Legion. A detachment of these men were onboard the warship Waning Moon under the command of Thousand Son Space Marine Mhotep during the early start of the Horus Heresy. They were set to board the mysterious vessel, the Furious Abyss but many were killed in the ambush attack from the Word Bearers in charge of the starship.

Source

• Battle for the Abyss (Novel) by Ben Counter

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