From the description:
The Dam at River's Bend is a self-contained adventure/encounter for the Mausritter roleplaying game, created for More Mausritter March 2021.
At the bend in the river, just where the trees get thick, a family of beavers have built a tremendous dam of branches and mud and moss. In the very middle hides their den - a dark and mossy hollow, hiding sharp teeth, biting claws, and whatever shiny trinkets the beavers have discovered in their travels. There is no easy season to approach the den, but then, the journey is the best part of any adventure.