I found some concept art for the Pentakill Band member's cinematic appearance

http://img0.reactor.cc/pics/post/League-of-Legends-фэндомы-leeroyvanilla-Sona-4329458.jpg

http://img1.reactor.cc/pics/post/League-of-Legends-фэндомы-leeroyvanilla-Sona-4329445.jpg

http://img0.reactor.cc/pics/post/League-of-Legends-фэндомы-leeroyvanilla-Sona-4329448.jpg

http://img0.reactor.cc/pics/post/League-of-Legends-фэндомы-leeroyvanilla-Sona-4329452.jpg

http://img1.reactor.cc/pics/post/League-of-Legends-фэндомы-leeroyvanilla-Sona-4329453.jpg

http://img0.reactor.cc/pics/post/League-of-Legends-фэндомы-leeroyvanilla-Sona-4329456.jpg

http://img0.reactor.cc/pics/post/League-of-Legends-фэндомы-artist-leeroyvanilla-4329406.jpg

I can see why some changes were made to these original concepts, but goddamnit, the Mordekaiser looked heckin' Metal.