What this mod does:
This mod adds the Kingdom Key, Oblivion, Oathkeeper, Kingdom Key D, Jungle King, Pumpkinhead, Three Wishes, and Spellbinder Keyblades from the Kingdom Hearts series by Square Enix.

How to get them in-game:
There's no way to get them without using CJB's CJB Item Spawner. This is the first mod I've ever made for a game, so I'm still working on how to get the Keyblades available without cheats. Once I do they'll most likely be available in the Traveling Cart south of The Farm.
Once you have the item spawner installed, search for the keyblades in the search bar and you should find them.

How to install: MAKE A BACKUP FIRST - SEE BELOW FOR HOW TO DO THIS
You'll need 7Zip or something similar to unzip the file.
Place the "Contents" folder inside your "Stardew Valley" folder.
If you installed it using Steam, this would most likely be "C:\Program Files (x86)\Steam\steamapps\common\Stardew Valley"
Make sure you overwrite the two files.

How to make a backup:
Make a folder somewhere safe to keep the backups if you already don't have one.
Copy the weapons.xmb in your "Stardew Valley\Content\Data" folder, and also the weapons.xmb in your "Stardew Valley\Content\TileSheets" folder.
Since they're both named the same, rename one to weaponsDATAbackip.xmb and the other to weaponsTILESHEETS.xmb (or something similar)

How to uninstall: THIS CAN ONLY BE DONE IF YOU BACKED UP YOUR FILES
Move your weaponsDATAbackip.xmb back to your "Stardew Valley\Content\Data" folder and rename it to "weapons.xmb" and overwrite the other file.
Move your weaponsTILESHEETS.xmb back yo your "Stardew Valley\Content\TileSheets" folder and rename it to "weapons.xmb" and overwrite the other file.

To do:
Balance the weapons more.
Add more Keyblades.

A note from me:
This is my first mod, and I'm surprised I managed to get this to work.
I will try to add more Keyblades very soon.