Where exactly is Skarner in current lore?

According to the few lines of new lore we have now, Skarner is now the guardian of "something" burried in the desert. Since Sivir and Cass could enter to the place you would expect to be the most heavily guarded in the entire desert and never even saw him, I can't help but wonder if he is guarding something else, or they forgot to add him. Where exactly is he right now?

For the people who don't know, Skarner had a very unique relation with Lore. In times of the JoJ, there was an ongoing narration which ultimately ended with the creation of the Crystal Scar as a new battleground. Skarner awoke when Zilean used a spell to time stop the soldiers from Demacia and Noxus fighting at Kalamanda. It really feels terrible that a champion linked so much to the lore was suddenly trown into a cave in the desert and forgotten, just like that.