superhuman hearing, vocal chords can project sonic energy as concussive force or energy lances, to shatter or disintegrate matter, create sonar pulses, or to cause unconsciousness, trances, or disorientation in others, flight, possessed by the Spirit of Variance
Banshee's real name was revealed in X-Men (1st series) #96.
Banshee's throat was cut in Uncanny X-Men (1st series) #405 by Mystique, leaving him powerless and recovering until in X-Men: Deadly Genesis #2 when Vulcan crashed a Blackbird into him. He was restored by the Apocalypse Twins in Uncanny Avengers (1st series) #9 using the Lifeseeds and Deathseeds they culled from the Celestials. Beast began working to undo the mutation they forced on Sean in #23, eventually being mostly successful as of Astonishing X-Men (4th series) #13.
Banshee was apparently killed fighting O*N*E in Uncanny X-Men (5th series) #21. He has since appeared on Krakoa in House of X #1, presumably as a result of the Resurrection Five's efforts.