Codex Arena/Zaishen Quest

Summary

 * 1) Win 3 battles in Codex Arena.
 * 2) *BONUS* Win 5 battles in a row in Codex Arena.
 * 3) *BONUS* Win 9 battles in Codex Arena.

Dialogue
"Balthazar favors the clever as well as the strong. Prove your worth by winning at least three battles in the Codex Arena before returning to Zehnchu."
 * Accept: "I can do that!"
 * Reject: "No, I'm way too busy today."