When Ruel entered the dungeon with Lucy, what he saw was a still landscape of a mansion.

It resembled a painting crafted by a skilled artist.

What could be prepared in this dungeon? As Ruel pondered this, he first felt unease when he noticed that Lucy was absent from the painting.

What is this? There’s a girl here, but why can’t I see her?

The one to answer Ruel, who was engulfed in confusion, was Lucy.

She was retreating from the attacks of an enemy that was neither visible nor audible, revealing what lurked throughout the entire dungeon.

Sensory disruption.