There is limited view in this map so you don’t have any choice but to carefully thread the shadows. There are dead ends that will teleport your unit back to a starting point and the enemies will only reveal themselves if you enter the correct room, preventing you from gaining the initiative. The first path is to the left, then north. There are no turn restrictions here so make sure to heal up using the forts in each room, Azura’s passive ability, and Felicia’s heal. There are also several rooms with treasure chests so it’s worth exploring the whole map. The rooms containing the chests will always have an enemy carrying a key so you’ll be able to loot all the chests in this mission.
There are two paths leading to the boss room, both leading to the empty pre-boss room where you’ll find Gunther. He’ll join your party automatically upon entering that room. If you haven’t visited the other rooms yet, this is the time to do so before finishing off the boss and seizing the throne.
From the starting point, enter the room to the west, north, then east to reach a room with several enemies and a single chest containing Killer Edge. From that room, there’s another small room to the west containing 5000g.
There’s also a large room to the westernmost side of the map, containing three chests. From the top, the chest contains an Armorslayer, Mend, and Rescue. To the north of that treasure room, there’s another small room with a single chest containing a Steel Sword.
Once you’re done collecting all the treasures, heal up and finish off the enemies in the boss area to seize the fort and complete the mission.