Warhammer 40,000: Tacticus kicks off Dawn of War IV crossover event

Warhammer 40,000: Tacticus is giving players a real reason to log in over the next month, not just a crossover banner to tap past. The Dawn of War IV event runs from May 28 through June 27 and centers on a campaign that pits the Dark Angels against the Necrons, with Lion El’Jonson, Captain Cyrus, and the Necron Chronomancer Thothmek all folded into the live game.

The timing is doing as much work as the content. Warhammer Community tied the collaboration to Warhammer Skulls 2026, and the event lands alongside a wider push for Warhammer 40,000: Dawn of War IV, which is due on September 17, 2026 on Steam. That makes Tacticus a clear bridge between mobile strategy and the long-awaited RTS sequel, especially for players already invested in the wider Warhammer video-game ecosystem.

What gives the crossover some weight is how much it changes the roster and the raid calendar. Lion El’Jonson arrives as a new Guild Raid boss on June 17, which immediately makes the event more than a one-and-done story chapter. Captain Cyrus, the Blood Ravens Scout Master, joins as a playable champion with Haywire Mines and an active ability called Strike from the Shadows, while Thothmek enters as another playable champion on May 31. Tacticus is also adding a new playable Machine of War, the Necron Canoptek Reanimator, which gives the event a concrete mechanical hook beyond character collecting.

That matters because the event is layered across several weeks instead of being compressed into a single launch beat. Players who care about guild coordination will have a reason to plan around Lion El’Jonson’s raid appearance, while roster builders get two new champions and a Machine of War that could shift team composition. For a mobile tactics game built around squad synergy and long-term progression, that is the kind of crossover that affects actual play, not just menu art.

The Dawn of War IV side of the crossover also carries its own pull. The game is being developed by KING Art Games and published by Deep Silver, and official materials say it will return to the series’ base-building RTS roots with four unique factions and more than 70 campaign missions. With Tacticus running its event at the same time, the mobile game is serving as a live-service lead-in to a larger Warhammer release cycle, and this one looks built to keep players engaged well beyond the first login.