Vel'Koz Disintegration Ray
According to Vel's lore, he absorbs information of different organisms by absorbing it as he death rays them. As such I think it would be worth trying to implement that into the game by giving his Disintegration Ray an added effect. If Vel'Koz kills a champion who leaves things across the map (e.g. Teemo's mushrooms and the upcoming Bard's shrines), he gains vision of all of the things they've left across the map as of the time of death. This vision remains until Vel'Koz next dies or until all of the traps have been triggered/expired.
: "Thank you for your... contribution."