Grom, the Juggernaut is a concept champion in League of Legends.
Manufactured as a prototype killing-machine for Viktor's glorious evolution, Grom was kept locked away for when Viktor would finally take his revenge on Jayce. With only one final piece remaining to complete this mighty construct Viktor grew impatient. He knew that every day he waited, Jayce's skill in combat would grow stronger. Bringing the incomplete golem to Piltover, Viktor sought out Jayce. Grom crushed all in this path and Piltover was in havoc. Little did Viktor know that the final piece missing was Grom's sentience inhibitor. The killing machine had a mind of its own. Injuring Viktor and making way for Zaun, Grom planned to destroy himself, knowing he was made only for destruction. However failing to do so, the Juggernaut roamed without purpose, until catching wind of an arena where champions would fight for peace. Grom now knew his true purpose, to join the League of Legends and defy his creator.
Grom knows no mercy, he was created without relent.