Necrons characters in 9th edition. During their long slumber, many Necrons went mad - their neural circuits corrupted by the long sleep, entropy slowly ruining them. As such, a wide cast of characters exist within their ranks, from obsessives to strategic geniuses. All of them are mighty warriors, with critical flaws - for a tragic streak. ADEPTUS MECHANICUS CODEX RELEASE DATE After its reveal in a May 16 Warhammer Community blog post, the 9th edition AdMech codex went up for pre-order on May 22, and was released on Saturday, May 29. You can order it from the GW webstore now. The 120-page codex includes all the usual good stuff: full rules for the new AdMech units, updated.