Ask him who he is

From Reddit Choose Your Own Adventure

You ask him who he is and after a short pause he explains, "I am the Grey Vine, I have trained many like you who have become legends of their worlds. Heroes of olde who have long perished but remain in the hearts of new generations.

 "In my time I have seen many save their worlds only to fall shortly after. I have been searching the cosmos for an honerable and couragous soul with the potenial for greatness.... and now your time has come."