Towards the end of the game, the guru of time, Gaspar, mentions various events
that can take place at different times. Completing the Sidequests, results in
various rewards ranging from merely gaining experience, to expanding on the
basic story line of the game, to receiving new items and equipment. You can do
many of these Sidequests at nearly anytime at the end of the game, but it is
easier to do them after the fall of Zeal, when you get the upgraded Epoch. For
some of the sidequests, you will NEED the upgraded Epoch.