Although Viktor and Jayce were primed to unveil their progress with hextech at Jayce's speech during the 200th Progress Day, Jayce ultimately heeded Heimerdinger's warning and kept their hextech innovations a secret—much to Viktor's disappointment.
Keep adding pressure, and eventually… something breaks.
In the first Act, Vander dominates the story with his powerful hold on the undercity.
Weapon in hand, Jayce marched to Zaun and began his one-man assault.