Elena and Azusa could have used teleportation to reach the Ruination Temple quickly but that would not be very fun. So instead they decided to use the the travelling method that the explorers of this world used to get to their destination.
This method was called the Dimensional Link. This was a world wide teleportation network which was jointly managed by the three great organizations. The upkeep cost of this network was extremely high but the benefit it provided was also immense.
But obviously this method had its limits. The Ruination Temple was located quite far away from where the ladies were. So they would need to use five dimensional anchors in minimum to reach close to it. Even then, they would only be able to reach close to the Ruination Temple and would need to travelled by regular means to actually enter this dangerous region.
