This is because, when he and his mother were stranded in the snow when he was a kid ... some "Arcane" fans in tears) and Hextech becomes standard all throughout Piltover. Eventually, Viktor ...

With Viktor sporting a very different look after his "Glorious Evolution" in Arcane Season 2, Riot introduced a VGU for the champion, "better aligning him to the Viktor fans were shown in Arcane," ...

Arcane reveals that Viktor himself was the mysterious mage who saved Jayce from a blizzard when he was a child, inspiring his quest to figure out how to control the arcane with science.