Annan, as the new generation of the Celestial Chariot, could not be detected by spells related to destiny. That is to say, when people from the past looked into Annan's future, they could only see nothingness.
The one most closely related to Annan was the "page" born from Tan Juan.
And this page from the Fragments of Truth was the most crucial... confirming that the people from the Otherworld were "players" and not "heroes," the chapter of the Undead.
If Annan hadn't existed, this page of truth might have been lost forever—
According to the original trajectory of fate, if Philip hadn't sent someone to assassinate Tan Juan, Tan Juan Geraint and Benjamin would have correctly proceeded to Frostwater Harbor.
Benjamin's primary purpose was to facilitate the birth of the "Mirror Ritual" — this was to obtain the power of time and mirrors, to enter that perpetually cycling nightmare and rescue his girlfriend.