(Rogue) Corrupt Cardinal Richelieu (Raid boss)

Additional Info
(Rogue) Corrupt Cardinal Richelieu is a hidden raid boss in the One for All, All for One Raid Event. When defeated, the discovery bonus is the The Ruby Key x8 and all participants with at least 1 million damage receive the The Ruby Key x2. It has 8 million HP, takes 2x damage and has a 2-hour time limit.