Imperial Sanctum (mission)/Zaishen Quest

Summary

 * Defeat Shiro.
 * *BONUS* Complete the mission in under 2.5 minutes (3 minutes in Hard Mode).
 * *BONUS* Complete the mission in Hard Mode.

Dialogue
The Imperial Sanctum in Kaineng City has been breached. Protect Cantha. Defeat the Shiro'ken army's nefarious leader.
 * Accept: I can do that!
 * Reject: No, I'm way too busy today.