The original seven different Challenges (grouped by your specialization’s role) will be available to try repeatedly, for the duration of Legion Timewalking: In Legion Timewalking, the Mage Tower will operate similarly to how it did during Legion. Azeroth’s champions will be able to enter the Mage Tower again. When Sargeras was later defeated and dealt his final vengeful blow to Azeroth, the Mage Tower was shut, and it has been inaccessible ever since.In 9.1.5, Legion Timewalking will become available for the first time, and with Timewalking comes a wondrous way to return to the moments of heroism from the past.
Soon after the Burning Legion invaded Azeroth at the Broken Shore, the Alliance and Horde began using the Mage Tower at Deliverance Point for high-end training of their most promising champions.