One possible theme is the fragility of sanity. When characters are in this adventure in madness, they often face situations that test how much they can hold on to their rational thinking. For example, they might see things that are not real or be in situations that defy logic.
Another theme could be self - discovery. Through the adventure in madness, characters may learn things about themselves that they never knew before. They might find hidden strengths or weaknesses as they struggle with the chaos around them. It's like a journey into the unknown parts of their own psyche.