User blog comment:LivesByProxy/Vision: Sight, Stealth, Detection, & Denial in LoL/@comment-24464243-20151015101734/@comment-24464243-20151016035356

The two heroes from DOTA I'm talking about are Keeper of the Light and Night Stalker, and the item is Aghanim's Scepter - an item that can be purchased by all but has different effects for each. Almost always it upgrades the hero's ultimate, but it can also affect other spells or just provide passive benefits. KotL, actually, gets all three; he gets the flying vision during the day, his Q also has a heal added to it during the day, and his ultimate permanent ( which changes his Q's behavior and gives him two extra abilities. )