They are part of the Daemonhunters Codex.
1. Red Dragon Codex 2. Bronze Dragon Codex 3. Black Dragon Codex 4. Brass Dragon Codex 5. Green Dragon Codex 6. Silver Dragon Codex 7. White Dragon Codex 8. Gold Dragon Codex 9. Blue Dragon Codex 10. Copper Dragon Codex (2011)
The Codex was created in 2005.
The next 40k codex in line is the Blood Angels codex.
The Codex was invented in the "Ancient Times"
Codex Pictures was created in 2008.
Codex Astensis was created in 1379.
Leningrad Codex was created in 1008.
Laurentian Codex was created in 1377.
Codex - novel - was created in 2004.
Codex Urbinas was created in 1542.
Codex Seraphinianus was created in 1981.
The Rivan Codex was created in 1999.