How does the Shadowfen Marshes contribute to the overall storyline of Guardian Tales?

The Shadowfen Marshes represent a corrupted and dangerous part of Atheria, often associated with a dark force or antagonist. It serves as a symbol of decay and the consequences of unchecked power. Guardians must venture into the Marshes to confront the source of the corruption, overcoming difficult terrain, hostile creatures, and the negative effects of the environment.