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From Warhammer 40k - Lexicanum
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==History==
[[Image:CadianPylon.jpg|thumb|right|120px|The [[Cadian Pylon|Cadian]] [[Pylon]]s, which were made of Blackstone{{Fn|3}}]]
In the distant past of the galaxy, ancient races understood the workings of blackstone. Something more advanced than both the [[Aeldari]] and [[Necrons]] created the [[Blackstone Fortresses]] long, long ago. Despite this, only the Necrons would carry the secrets of blackstone into the present dayfuture.{{Fn|16b}} Millions of years ago, the ancient [[Necron]]s used Noctilith to build a variety of [[Warp]]-dampening [[Pylon]]s across the [[Galaxy]].{{Fn|3}}{{Fn|13a}}
In the time of the [[Great Crusade]], the [[Adeptus Custodes|Custodian Guard]] constructed a [[Blackstone (Prison)|prison]] on [[Terra]] made of Blackstone salvaged from [[Cadia]] to hold their most dangerous captives.{{Fn|12}}