In January 2026, as the writing room for Amazon’s highly anticipated Warhammer 40,000 series officially wrapped its work on Season 1, the lights went out across the production offices—almost everywhere. Almost. According to multiple sources close to the project, one figure routinely stayed behind long after midnight, still hunched over scripts at 4 a.m.: executive producer and star Henry Cavill.

This is not a case of performative dedication or celebrity micromanagement. For Cavill, Warhammer 40,000 is not simply another prestige streaming project—it is sacred text. And he has positioned himself as its final line of defense.

While the writers completed their drafts, Cavill reportedly undertook what crew members have dubbed “lore audits,” personally reviewing more than 300 individual lines of dialogue, terminology, and world-building detail. This included verifying Space Marine chapter armor color schemes, cross-checking Imperial iconography, and ensuring the correct pronunciation of notoriously dense High Gothic terms like Adeptus Astartes. In a universe where one incorrect insignia can spark fan outrage, Cavill is