Error Code: 400 - This is getting annoying. This error still occurs since PB4. It forces us to exit the game, and restart Illuvium. And when I get back where I left of, I'm still getting the same error. Over and over, that sometimes I don't play for a long period of time. Then, get back again. I keep reporting this at in-game support (B) as crash report.
Alternative Solution: Either escape the match that you won't get the Illuvial you want, or by luck when the error won't happen after several restart.