Acts of Vengeance conclusion. "The Breaking Strain!" Story by John Byrne. Art by John Byrne and Paul Ryan. Story continued from Avengers (1997 3rd Series) #313. The true mastermind behind the organization of the super-villain community stands revealed, and it is Thor's half-brother, Loki the God of Evil! Loki was the first foe the Avengers ever fought and the reason for their formation. Now the Avengers, East and West Coast, must unite to put an end to the Acts of Vengeance.