CowWithHat's Custom Spells mod

You will need the mods Unity Mod Manager and the Call of the Wild.

They be accessed here and here respectively

https://www.nexusmods.com/site/mods/21?tab=files

https://www.nexusmods.com/pathfinderkingmaker/mods/112?tab=files

To install this or Call of the Wild, you will first need to unzip the UnityModManager zip, run it, and link it to the Pathfinder Kingmaker install folder. Drag the zip from this mod and the zip from Call of the Wild into UMM and that should be it. 

Have fun!