This is an official spell already in the game !

Enable the crafting of the "hidden" spell Inner Demon !

This spell gives an int buff and access to 2 new spell (ain't gonna spoil them)

You need 3 source Necromancer skill book to craft it.

Install:

Unrar the mod into your "/mod/" folder (either the documents and settings one or the program files one) then activate it in the main menu.

It shouldn't break your save. 
If it does, well.. dont sue me.

Bigass thanks to Paradigm@Discord for his Hi-rez screenshot and beta-testing !

ps: in the crafting menu, the icon + name is bugged. I'm too tired to fix it atm so deal with it, it's only graphical.
ps²: I didn't test it with a char in for joy, no ideas if it works. Nor do I tried to learn it with a char already having Inner demon through 'natural' means. Who knows what it does. I don't !