with the power of command blocks, I'm making a vanilla mod which allows you to custom craft elemental stones. Unfortunately it's not finished and I'm not sure when it will be complete, but if you want to download consider following me. I'll be sure to post more content like this in the future! Also this is not multiplayer friendly, so beware
Current features:

Fire stone-when you drop it, it will explode into fire when it touches the ground, lighting all nearby mobs

Lightning stone-throw it and when it hits the ground, lightning strikes at its position

Custom crafting-I'm not talking about floor crafting, put the following recipe into a dropper and it will the respectable item

Future features:

staffs

bows

equipment

Any Ideas? Be sure to let me know!