The wandering minstrel has always been oddly aware of things, not only because of the Warrior of Light just telling him stuff, but by his nature as pseudo-canon self-insert. But in The Path Infernal he a) brings up the fact that the crystals that dot the landscape of Eorzea following the Seventh Umbral Calamity are from the Phoenix even when he should have no reason to know this, and b) sends the Warrior and Clive into a simulacrum of their memory and eventually enchants a horn to summon a facsimile Torgal that can fly.

Now, besides the obvious, Doylist answer that he's a developer self-insert who is there to facilitate the quest and its rewards (like he does for the EX trial mount rewards and the idea behind many EX trials and Ultimates to begin with), from a Watsionian perspective.... what the heck is he? Besides magic, he's clearly magic.