Greater Corruption is a spell within the Arceuus spellbook that requires level 85 Magic and the completion of A Kingdom Divided to be cast. It can only be cast on opposing players.
When cast, the player's next successful hit has a 66% chance of inflicting corruption onto the target. Targets under the effects of the Mark of Darkness spell will cause corruption to occur twice as often.
Players cannot cast corruption spells on a target if they are currently corrupted, nor can they do so while the target is under the effects of the Ward of Arceuus spell. However, there is no immunity period after corruption wears off on a target.