Update:
Based on some date/time stamps on some screen shots, I figured out that it was Season-4 in 2023.
Is there a way to tell which season my characters rolled over from? I have a bunch of characters that I stopped playing several seasons ago. However, I’m not sure how long ago that was. However, I believe it was during COVID-19 or shortly before COVID-19. When I last played I remember that terror zones were added to the game and items that break enemy immunity and lowers the chars resistance to the same element. I can’t remember the item name, and there were some newer ladder rune words added to the game.