To encounter Chronos in Hades 2, Melinoe will have to become stronger and get rid of her weaknesses, and Moss is one of the essential elements on this path. Thanks to this simple material, you can upgrade your weapons, earn some bones, and learn a few incantations. But more importantly, Moss is one of the ingredients for the Unraveling a Fateful Bond ritual that will let Melinoe breathe on the surface, so getting it is vital.