
This mod makes all charms cost a single notch, with the exception of Wayward Compass and Gathering Swarm, which are made to cost nothing.

This mod has no dependencies, but requires a new game in order to work.

Simply replace the file Assembly-CSharp.dll in your ..\Hollow Knight\hollow_knight_Data\Managed folder.

Obviously, this mod will not work with any other mod that edits the Assembly-CSharp.dll file.

The Kingsoul and Carefree Melody charms are not affected by this mod. I currently don't know why this happens, but I suspect that, because these two specific charms are obtained through quests and crafted piece by piece, the game resets any alterations this mod makes when the charms are finalized. As such, they maintain their original vanilla cost. If you really want to alter the cost of Carefree Melody (no need to bother with Kingsoul, as its final form is free anyway), I suggest you use a save-game editor like this one to edit its cost after you have acquired the charm. Just make sure to read the instructions carefully and make backups before editing anything.
Since this mod alters a core file of the game, whenever the developers publish an update or a patch for the game, this mod will probably stop working for new players until I update it. People who are already using the mod need not worry. After all, the mod's changes affect only the initialisation at the start of a new savegame. As long as you have already started a new game with the mod, you can enjoy any updates without problems.