[quote=@Vongola_Hasayo]
Creating completely new flames is prohibited. Flames that are a variation like the flame of Wrath are allowed but are heavily moderated. Though reading about the flames it seems it can only occur with people who possess the sky flame dye to its ability to harmonize with the other flames. The flame of Wrath is a mix of sky and storm boosting the storm's degeneration ability so instead of being gradual degeneration it's instant destruction.
[/quote]

This is true. The sky flame can mix itself with other flames. So if a person has two flames from birth they can do it. Nicolas was born with this unique flame which is why he has the two. I mean aside from that all it is is a combination of the sky and rain like I said which wash just something I hit would work very well. If the storm flames brings about wrath,rain flames ring about peace or, to some, subjugation. 

More importantly... 
Luca's gonna need a bigger house xD