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From Warhammer 40k - Lexicanum
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Edited for spelling, grammar, clarity
==Background==
The Sky Sentinels were sent to reclaim the [[Agri World]] [[Sondheim V]] but upon seeing the situation planetside, of turmoil between from [[Hive Fleet Leviathan]] and the forces of the [[Daemon Prince]] [[M'kar the Reborn]]. Upon seeing the turmoil of the situation planetside, however, the chapter opted to launch [[Exterminatus]] against the planet instead.{{Fn|2}}
In the aftermath of the [[Great Rift]]'s creation, during the [[Thirteenth Black Crusade]], the Chapter's Homeworld was invaded by [[Chaos]] forces led by the [[Daemon Primarch]] [[Magnus]]. Every Sky Sentinel came to [[Pranagar]]'s defense during the invasion, but it was not enough and the entire Chapter was destroyed, before Magnus' forces overran their Homeworld.{{Fn|3}}
