I know Tiburtus and Falcan got nerfed, and their combo debuff got one of the hardest (Note 1). Sonya and Melendor have duplicate secondary effects but they should improve the effectiveness of Time Stop (a favorite for this event in my alliance since it compliments Tornado so well).
Note 1)
Lower Defense from Tiburtus and Lower fire defense from Falcon so the combo is hugely impacted
Defense tweak