League of Legends Reverse Summon

In Valoran, there is a summoner with mysterious power. They can summon creatures from different time and space. An unfortunate or lucky ordinary earthling was summoned to Valoran by accident. In this world where heroes emerge in large numbers and decide everything by force, what kind of legend will he stage? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.