Mordekaiser - The Iron Revenant (Trailer Theme Song)
Original song is made by Frédéric Vitani and it's named Painful Fight!
Well... for those who liked the song from the video "Mordekaiser: Reimagining the Iron Revenant - Behind the Scenes" at the end, here I am with the full version edited by me. I combined the last part from League of Legends and the original song.
~Enjoy!