Fire Emblem: Binding Blade Walkthrough Part 21: Chapter 17 - The Bishop's Teaching
From here on the game has two seperate routes again. If your Nomads leveled up more than your Pegasus Knights then you'll go down this route. If your Pegasus Knights leveled up more than your Nomads then you'll go down the other route, though.
The map for this route is more difficult than the map for the other route. The other map is a normal one where you have to conquer the castle while this map is a Fog of War one, meaning you can only see a few spaces ahead. There will also be thieves on this map trying to annoy you.
Should you end up on the other route, here is a helpful map and explanation I found online when trying to find a way to satisfy people on the other side: http://fireemblem.wikia.com/wiki/The_Path_Through_the_Ocean
A bit of training was done at the colisseum to get Zeiss up to speed.
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