Silverfen:

The Silverfen is a sly, otter-like creature that lurks in the misty wetlands of the Isles of Macroura. With its shimmering silver fur, it can vanish into the fog, making it nearly impossible to spot until it's too late. Known for its mischievous and often mean nature, the Silverfen is said to lure travelers deeper into the marsh by imitating splashing sounds, only to leave them lost in the swamp. Despite its small size, locals treat it with caution, as the Silverfen delights in playing tricks on anyone who enters its territory.