Everything you have done, earned, purchased, or unlocked will cease to be.
Key art for the soon to be shut down battle royale game Call of Duty: Warzone Caldera.

On September 21, 2023, Call of Duty: Warzone Caldera will be taken offline for good. All gameplay, progress, purchased items, inventories, and online services will go away on that day. This has been announced by Activision Blizzard via a blog post that went up earlier today.

Activision Blizzard says that they made this decision in order to "focus on future Call of Duty content including the current Warzone free-to-play experience."

Players should prepare for even more Warzone content across consoles and PC, as well as a new era of Battle Royale on the go with the launch of Call of Duty®: Warzone™ Mobile, which includes a shared Battle Pass and cross-progression. The Call of Duty team and Studios look forward to sharing more details soon.
The small bit of silver lining here is that multiplayer content for Call of Duty: Modern Warfare (2019), Black Ops Cold War, and Vanguard, will remain untouched. And, this should go without saying, the current version of Warzone that began with Modern Warfare 2 will also not be impacted by Warzone Caldera going offline. Though that's not to say that the same fate won't befall the current Warzone a few years down the line.

The first iteration of Warzone launched in March 2020. Call of Duty: Warzone Caldera was the name given to this original version of Warzone after Warzone 2.0 released with Modern Warfare 2 in 2022. Activision Blizzard renamed the old Warzone to Warzone Caldera at the time of 2.0's release to signify that they were separate games with separate content.

Even when Warzone 2.0 launched in November 2022, there was no way to transfer content or unlocks between the old game and new one. The only choice dedicated Warzone Caldera players will have going forward is to play Warzone 2.0 or move on to something else entirely.

It seems safe to say that the reaction from fans has been less than favorable. The biggest complaints are from those that spent any amount of money on cosmetics or other unique items that they will never see again come September 21st. The reaction from current Warzone 2.0 players is more akin to uncertainty for the future, and a new reluctance to want to purchase new items or cosmetics given that they could simply disappear at any time.