If you manage to make it to the castle The Lost Castle 2So you've probably met a strange new character named Nia. The game will initially introduce her as an amnesiac girl, and she will be brought to your camp after you make significant progress in one of your runs.
Contrary to what you might see online, you don't actually have to defeat the final boss of the race to meet Nia, but she won't serve any purpose for you until you defeat the boss. Until then, she will stay in your camp with an unknown purpose that won't reveal itself until you deal with the final boss.
What is Ethereal Nightmare Mode and how to unlock it
Ethereal Nightmare Mode is essential New Game+ or post-game content of The Lost Castle 2. Once you defeat the Steward the Demon Sealer in the Black Castle and the subsequent Demon BossYou will be brought back to camp and successfully complete your first full run. Once you're back at the camp, approach Nia, who is standing in the middle of the camp by the ethereal device.
You should get a prompt telling you that Nightmare Mode is unlocked, and you can also watch a cutscene introducing Nia if she isn't already hanging around your camp. Talk to Nia and ask to use the Ethereal DeviceAnd you'll be brought to a screen that shows you the various debuffs you can put on your next run and how Ethereal Nightmare affects your run.
Since the difficulty options are easy and normal in the base part of the game, you can Think of it as the game's hard mode.
When applying debuffs, you'll see numbers at the top of the bar that fill up when debuffs are applied. These numbers are the depths of an ethereal nightmare. You need a set number of debuffs to enter each depth, but you need to complete each depth to unlock the next one.. So if you think you're ready to go depth 3, you won't be able to without clearing 1 and 2 first.
On the right side, you'll also see an overview of the run, showing a breakdown of everything you've selected and its effect on you.
This mode is complete Designed to test your ability to create a fully fleshed-out, cohesive build. It's possible to beat the initial run with any random combination of items, but the same won't be true for Ethereal Nightmare Mode, and you'll need to strategize a functional build to accomplish this. Doing so will provide rare resources and permanent upgrades to your build.
It is highly recommended that you work on a tank build, but there are a variety of builds that will work. There will be one Achievement for unlocking and completing each depth of Ethereal Nightmare Mode.

Lost Castle 2: Forest Guardians Boss Guide
Here's how to beat the Forest Guardian boss in Lost Castle 2.
What are the Ethereal Nightmare Mod Rewards?
As mentioned, any Ethereal Nightmare depth you'll earn from a run will, in addition to unlocking the associated achievements. Soulstones, Soul Flowers, and Champion's Relics. These items work as follows:
|
object |
Description |
|---|---|
|
Soulstones |
Used to buff base stats of weapons. They work in tandem with Soul Flowers and Champion's Relics, as you need to unlock the weapon's Soul Inscription first. If you have a surplus of unused Soulstones, you'll be able to use the Soulstone Smelting feature to trade 10 in for a chance at a rare Soulstone, depending on the level you trade. |
|
Soul flowers |
A specific weapon's soul inscription is used to unlock it, which requires it to be permanently upgraded. |
|
Champion's Remnant |
Unlocks a random weapon's Soul Inscription without the need for Soul Flowers. |
Be sure Check with Nia each time you return to camp To make sure she has nothing to offer you. Even if you don't plan to adjust the settings for your next run.

Lost Castle 2: Mad Gardener Boss Guide
Here's how to beat the Mad Gardener boss of the Black Forest in Lost Castle 2.