Quick Answer
You reach Siraatsu Castle by getting the Shock Rifle and Blue Seal Breaker in the Ancient World, then powering three towers to unseal the bridge. Inside, beat all three bosses to open the giant door to Siraatsu. This page covers what's known so far and keeps growing.
How do you reach Siraatsu Castle?
Three power towers with blue lights keep the bridge sealed, so you need to power all three.
Reach the room with three metal boxes
Use the teleporter houses in the Ancient World until you arrive in a room with three metal boxes and one skeleton on the floor.
Go through the cave on your left
Fight through the cave full of enemies. Leave by its upper exit, then turn left.
Clear the dungeon under the house
Finish the platforming section to reach the house, then clear the dungeon beneath it. The Shock Rifle and Blue Seal Breaker are at the end.
Power the three towers
Open each pyramid-shaped tower with the Blue Seal Breaker and solve its node puzzle with the Shock Rifle. Two towers are easy to spot from far away, and the third stands on its own island.
How do you solve the tower node puzzle?
Power every node without giving any node power twice.
When you shoot a node, the nodes around it get power too. A node that gets power twice overloads and shuts off, so plan your shots before you fire.
How do you open the giant door?
Beat the three bosses inside the castle. Each one lights one of the three sigils on the foyer's main door.
- One waits at the end of the long upstairs hallway near the save point.
- Another fight is the pair on the bed. Interact with the bed to start it.
- If you can't find the last one, search the rooms near the teleporter.
See the Queen's Domain bosses list for the fights you know so far. Behind the door you face the Queen's Domain final boss, and players say you can keep playing after beating Siraatsu.
Where is the Mystic Mirror?
Players report it in the left wing on the top floor, in a room with blue vats. Look behind the elevated vats on the left, between the liquid containers.
What if a door or boss stops responding?
One player reported walking through closed doors during the boss fight in front of the castle, then being unable to interact with the boss after killing it. They had also saved in that area.
Avoid saving in that area if something looks broken. See how to save in Queen's Domain before the fight.
FAQ
You need the Blue Seal Breaker and the Shock Rifle, then all three power towers running.
You beat three bosses to open the giant door, then you can fight Siraatsu.
Players say yes, so you can finish other goals afterward.