The History of Britannia Minax wanted to avenge the death of her lover, so she used the time gates created by Mondain's defeat to travel to the Time of Legends, a place located at the origin of times.
The History of Britannia, page 1 Minax wanted to avenge the death of her lover; thus, after much research, she learned of the Stranger's homeworld. To destroy it, she created dimensional and time gates to set up the Time of Legends, a place located at the Origin of Times.