Odin tells Frigga to pray to Thor. When the Thor Corps arrive, Malekith uses the Venom symbiote's powers to grow wings as he declares himself the Butcher of Thors.
Odin instructs Frigga to call upon Thor's name in prayer. When the Thor Task Force arrives, Malekith uses the Venom symbiote's abilities to grow wings, proclaiming himself the Slayer of Thor.