The First Corruption Attack
While Corruption was trying to stop Daf from getting to Crestfall, he decided to attack Daf. This led to a battle in which Daf fled to not be murdered. There isn't much information about this battle.
Corruption in Crestfall
In one of the first Corruption battles, Daf was paralyzed from the waist down by Corruptions attack.
Daf, still paralyzed, told Scarf Heroes about Corruption's weakness. Doing so also telling them about the Multis' weaknesses.