ZERO Sievert Christmas Update Is Live!
ZERO Sievert Patch Notes — December 18, 2025
Aggregated from Steam, cross-tracked with Battle.net coverage on GamePatchNote.
🎄 ZERO Sievert Christmas Update Is Live!
The Christmas Event is back in ZERO Sievert!
Jump into the Zone during the holidays to hunt for festive loot, upgraded airdrops, and new backpacks including drops from NPCs for the first time ever.
🎒 NPCs now drop backpacks
🎁 9 brand-new backpacks added
🎄 Christmas airdrops guaranteed festive gear
Good luck out there, and get Santa some milk!
🎄 Christmas Event Returns
The holidays have arrived in the Zone once again.
The Christmas Event is now enabled, bringing back festive loot and themed encounters.
If you extract alive while carrying a Christmas Event item, it will be automatically added to your stash when starting a new game.
Limit: 1 per unique item, except grenades (up to 5).
Christmas Airdrops have been improved:
Now have a 100% chance to spawn at least one piece of Christmas equipment.
Will never spawn in the Horizon area on the Industrial map, ensuring better access and fairer risk.
Santa Claus has upgraded his loadout and now carries a Christmas Backpack — keep an eye out.
🎒 Backpacks & Loot Changes
One of the most requested features is finally here.
NPCs now drop their backpacks when defeated, allowing players to loot them directly.
Added 9 new backpacks, expanding storage options and loot variety.
Added custom spawn chance settings for backpacks, giving players more control over balance and progression.
⚙️ Quality of Life & Settings
Several improvements based directly on player feedback:
Added a setting to toggle the ammunition icon introduced in the last update.
You can now uninstall and reinstall modules without crafting a base module kit again, making experimentation and loadout changes far less punishing.
That's it for this one! Thank you again for all of your feedback, ideas and carnage Hunters!
Merry Christmas from all of us here at ZERO Sievert