Ulysses Klaue was hired by A.I.M. to steal Vibranium from Wakanda. However, Klaue, focused on getting revenge on the current Black Panther, T'Challa, whose father killed Klaue's own father. This lead A.I.M. to fire him, so he launched his own attack on Wakanda. While fighting the Avengers, Klaue fell into the Vibranium Mound, which turned his body into pure sonic energy.[1]