Is there a definitive list of canon changes in Warhammer 40K? I've been reading some older source material, and some more recent codexes, and it is hard to keep track of what has been changed at times, particularly with races that have changed a lot over time. I've tried looking through the wikis, but most of the articles I can find only list current lore, without much tracking of changes over time.

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    Lexicanum articles sometimes have a paragraph about canon conflict. Far from being complete. – Taladris Nov 6 '15 at 5:00
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    @Taladris Tell me about it. I'd never heard of the battle between Horus and the Emperor originally being in Horus's bunker until I got a chance to read a very early White Dwarf article. Also something about a guardsmen throwing himself in the fray to buy the Emperor time to recover from a blow with his body? – Canageek Nov 6 '15 at 5:06
  • old stuff is old stuff. It gets retconed by the new stuff. The Horus Heresy books deal with the entire heresy on their own. So there will be a book about the lats battle aboard the vengefull spirit, killing of Sanguinius, Killing of horus etc in good time. Black Library are introducing tons and tons of new writers and are teasing out the heresy very, vey slowly. so something writen about 20 years ago will prob get cut just coz... deal with it like the rest of us (by crying in the night in a pillow when we think nobody else can hear) – Cherubel Nov 6 '15 at 10:12
  • @Cherubel I thought Black Library things such as the novels were not counted as official canon, only codexes, data slates, etc directly published by GW or (possibly) Forge World? – Canageek Nov 7 '15 at 1:19
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    @Canageek Black library is a part of GW. So it is canon or at least part of cannon. GW has final say what can and cannot come into the books. For example if a writer just wants to write about killing off the Ultramarine chapter he cant coz GW wont allow it unless it goes well with the curent events in the 42nd millenium. After the 13th black crusade, ocupation of Cadia etc wierd stuff might happen. But when all is said and done GW has to approve what gets published. – Cherubel Nov 7 '15 at 2:21

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