Zombies arrived in Call of Duty: Warzone just last month, and they’ve now begun migrating across the battle royale’s map, and taken up residence in Verdansk’s Prison.As teased in an ‘in-universe’ blog post, the zombies that washed ashore with the addition of a ghost ship to Verdansk’s northern shore have now been found in the Prison Complex area nearby.

Similarly to the ship, a terminal has been added to the Prison, which allows players to kick off a zombie-killing event, offering extra loot when 40 undead shamblers are dispatched.

The move could presage major changes for Verdansk, with some believing they’ll slowly take over multiple areas, before the game’s slowly-added nukes are deployed, triggering a radical change to the map.

That’s an idea supported by a leak that seems to point to a zombie-themed event called Plague in which the area can be nuked. The aformentioned blogpost also includes a header image that says 5% – possibly pointing to how much of the map is now affected by zombies.

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All of these additions may make those on older hardware nervous, especially as a 500GB PS4 may no longer be able to fit Call of Duty: Black Ops Cold War and Warzone. Want to earn yourself a victory in Warzone? We have a Call of Duty: Warzone wiki for you.

Joe Skrebels is IGN’s Executive Editor of News, and he’s furious at this change, because Prison is one of the only places he feels like he’s safe in during Warzone matches. Follow him on Twitter. Have a tip for us? Want to discuss a possible story? Please send an email to newstips@ign.com.