Jayce Talis is a character in the TV series Arcane and the game League of Legends:
Abilities
Jayce is a gifted inventor who can create many contraptions, especially those that use hextech gemstones. He also has a transforming hextech hammer that gives him new abilities depending on which stance he uses.
Role
Jayce is a founding father of hextech, which he created with his friend Viktor. He became the head of the Council of Piltover and is known as "the Man of Progress."