- Explore the Slazish Fens and destroy the Naga's portal
- (optional?) Defeat Lady Zoisla the Tidebringer
- Return to the Far East
Destroying the portal in the Slazish Fens teleports you (and Zoisla) to a random level of a random starter zone in the west.
You can't return to the Far East until halfway into the plot. Thus, the quest will only really be complete when you have reached that point. Regardless of that, you can still proceed as you would normally.