Pandemic Expert Challenge Romashka 03.03.2019 2018, Charm, Chibi, Weekly Challenges Reward Comments 20/03/2018 Pandemic Expert Challenge overview Rainbow Six Siege – Pandemic Expert Challenge Survive the Outbreak again with the Ubisoft Club Challenge. Win 2 games in Outbreak on Pandemic difficulty to unlock the Smasher Chibi charm. Smasher Chibi charm