Capture the Flag. Will and Nico are on opposing teams. Will tries to use his sunlight powers to throw Nico off his shadow-traveling game. ((Mansi’s sunlight-controlling headcanon. His art is awesome, you should check them out!
HOW NICO AND WILL R SUPPOSED TO B! both will and nico are older here and are good friends, but they’re not together. also the two of them probably sat down later and will told nico all he knew about each name on his arm