Rhidian you the man! I love it!
I'm going to try adding it to my own game.
Now, from my reading of your post, it looks like this effect replaces the normal rain effect of the rain spell.
I like the rain spell

so I'm wondering if I could replace the effects of one of the other spells (that I never use) and keep the rain spell as it is.
Better yet, I wonder if it's possible to add the effect to a new scroll or potion?
But brilliant work Rhidian! And bless you for sharing! As Cromcrom said, this is what a true modding community should be. Thank you!