One of the first items that might seem egregiously expensive in Hollow Knight: Silksong is the Simple Key. You’ll see this upon opening the merchant's shop in Bone Bottom, and think to yourself, “500 ...

Some of the Simple Keys you'll find are ones you'll have to buy from different vendors, who demand large amounts of Rosaries in Silksong for the item. On the other hand, other Key ...

Simple keys in Hollow Knight: Silksong are used to open doors scattered around Pharloom, but they're few and far between. As you're exploring Silksong, you've probably come across a few locked doors.