Those unfortunate souls fighting near trees during the Great Bombardment became trapped in swiftly growing amber structures. Some stalkers claim they see breathing from those preserved inside the amber grasps.
Concept for a personal IP called KOM-44. An alternative history where the Soviet Union becomes the Kommissariat (KOM) after bombs fall at the end of WWII. The KOM remains untouched and surrounded by an immense wall, but the rest of the world has become an immense exclusion zone filled with anomalies and land that defies time and physics.
Previous KOM-44 Concepts:
https://www.artstation.com/artwork/OyzEww
https://www.artstation.com/artwork/rRKAWG