Urtistan just so happened to be along Vel'Koz's path as he travelled Runeterra collecting information, but there's quite a lot of places untouched by the Void, so it makes sense that it would be close to Icathia, probably closer than most of Shurima. Urtistan's existence might not even be canon anymore since Zilean's current lore definitely isn't, though, and anyhow they should probably expand upon Icathia more through Jax and Kassadin; meanwhile Zilean should probably have some relationship with Ryze since they were both intimately personally affected by the Rune War--maybe they make common cause, maybe Zilean's time magic is powered by a World Rune and Ryze wants to put a stop to it, something like that. Also, we need clarification on a timeline of major events on Runeterra--like, at least, put the Ruination, the Rune War, and the fall of Icathia in order or something, that'd be nice lol