The reunion of the Maerum and Alatien.
Also known as the "Great Wind," the Day of Ascension is the time when the Draic Kin will return to their home among the stars. The Old God is sleeping at the bottom of the Great Ocean in preparation for this day, and praises April's work to reunify the Maerum and the Alatien, as bringing the two races together in preparation for the Day of Ascension was vitally important work.
The Alatien refer to this event as the "Great Wind" that will return them home, the first sign of which is the coming of the Windbringer. The Maerum also have a concept of the Day of Ascension, when they will "ride to distant seas" on the Old God's back.