23 CLE: The Noxian refugee crisis created by the Void War culminates in war in Shon-Xan. Ionia defeats Noxus, and much of the Noxian military is destroyed.
24 CLE: The discovery of pyrikhos in Shurima catalyzes the Hextech Revolution. Conflict over the use of pyrikhos ends with the Battle of Shurima between Demacia and Zaun, and their respective allies. A resurgent Noxus joins Zaun in dealing Demacia a crushing defeat.
24 CLE: The continent of Nyroth is discovered, and several Valoranian nations compete to explore and control this new realm. In the end, Ionia prevails, and together with the Freljord restores Nyroth to its pre-cataclysm state.
25 CLE: Azir proclaims Shurima's independence, and wins recognition from the League on the Fields of Justice. In the end, Noxus succeeds in reasserting its old territorial claims, and establishes a new Noxian dominion that encompasses a significant part of the Shuriman desert.