To enter the boss door and fight Estuary Naamah in the Kerguelen Plateau, you will first need to find two Lillies of the Valley. These are hidden in the same rooms each run, but the rooms' locations can change. Here is where to find and how to get all three Lilies of the Valley in Rogue Legacy 2.
How to get the Lilies of the Valley in Rogue Legacy 2
You only need two Lilies of the Valley to enter the boss door in Kerguelen Plateau. Here is where to find all Lilies of the Valley in Rogue Legacy 2 and how to get them.
Lily of the Valley 1
To get the Lily of the Valley in this room, you will need the double jump ability or another skill like the Ranger's class ability to get an extra jump or additional height. Follow the path of the red arrow, triggering the arrow trap. Use the Spin Kick on the arrows and then jump to the Lily or go left to the platform. You can reach the Lily from the left platform.
Lily of the Valley 2
This is the simplest Lily of the Valley to collect. Just follow the red arrow, using your double jump and dash to reach the platform with the Lily.
Lily of the Valley 3
You will need some careful timing to get this Lily of the Valley. Follow the first red arrow, dropping down from the wooden platform. Next, dash across and drop to the Spin Kick platform. Use your Spin Kick, then dash over the spikes. You will land on safe ground. From here, you can simply use your double jump to reach the Lily of the Valley on the platform above.