At the start, every Crest has a limit for how many tools you can attach to it. You will have to find a Memory Locket to open new slots. These items are found throughout the world in hidden areas, and ...

The Greymoor is a vast, damp area in Hollow Knight: Silksong that has lots to explore all around. It is one of the larger areas that you have seen at this point and is much more wide open as well.