Deathswamp

Publisher's blurb:

There are still people alive who remember the land around their village as a lush, vibrant forest. However, in the last few decades, some of the forest has died to be replaced by a decaying, life-sucking marshland. The marsh continues to grow, casting a shadow over the plants and animals in the area. Crops are dying. Animals are becoming twisted, aggressive, mutated versions of what they used to be and the rest of the forest continues to succumb to its cloud of decay. Many who enter the marsh never return. The people have called it Deathswamp.

Maybe you will succumb like those before. Maybe you will survive. Maybe you will even discover the secret of the Deathswamp.