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However, his reign would not last long, as Hive Fleet Leviathan soon descended on the world. In the ensuing battle, Carnifexes battled Bloodthirsters in the streets whilst Zoanthropes conducted psychic duels with Lords of Change. The Sky Sentinels Chapter were dispatched to reclaim Sondheim V for the Imperium. But upon seeing the situation they opted to call in Exterminatus instead.
A stay of execution was ordered by Grand Master Vardan Kai when he arrived at the planet leading a Grey Knights strike force. The Exterminatus was to be delayed to give enough time for the Grey Knights to capture the Book of Pandegaras, a cursed tome which had given M'kar the power to alter the planet. The Grey Knights made planetfall and made it through the twisted landscape to the temple in which the book was stored, but they quickly became overwhelmed and trapped by both Tyranid and Daemonic forces. Kai contacted the Sky Sentinels fleet and ordered them to bombard the temple site. The Grey Knights' superior armour protected them from the bombardments, but the Daemons and Tyranids were not so fortunate. As the bombing stopped, the Grey Knights evacuated with the Book of Pandegaras whilst the Sky Sentinels began Exterminatus of the planet. When the cleansing of the planet was completed, the Sky Sentinels surrendered themselves to the Grey Knights for mindwipe.
- 1: Codex: Tyranids (5th Edition), pgs. 28–31
- 2: Codex: Grey Knights (5th Edition), pgs. 14–17
- 3: Codex: Tyranids (6th Edition) (E-Book Edition) — The Fall of Shadowbrink, map