I would like you to have this, Warrior of Light.
It is an Allagan tomestone similar to the one we recovered after your victory over Sephirot. The records contained within describe the Goddess at the height of her power, and will enable Azys Lla's reality augmentation technologies to generate an idealized simulacrum of Sophia against whom to test your skills.
From what I have been able to determine, this formed part of a greater trial intended to test Allag's elite warriors. Quite how it will compare to the challenge presented by the Fiend's tomestone, I cannot say...
I suppose there is only one way to be certain. Visit the verification node on Azys Lla, and witness firsthand what awaited the champions of eld.