After defeating Hans and his troop of soldiers, you reach the staircase that will lead to the throne room.
Defeat the Boss
The objective of this battle is to defeat Iago, who is in the north part of the map, surrounded by strong units.
There is a Dragon Vein in the center of the map. If you activate it, it will destroy all of the weapons of any enemy units that are in the center area. Once their weapons are destroyed, they will stop moving and will be very easy to defeat.
There are chests in the northwest and northeast of the map. The northwest chests contain a Pursuer and Arms Scroll, and the northeast chests contain Boots and a Water Wheel.