Thanks for your Answer doc. One question I have: You once said that Rontu & Egalt developed RD Technique just as a martial arts technique and it happened to be a counter against Shatterspin. Wouldn't that mean that RD Technique is useful also against enemies without Shatterspin?

It's not canon

In my headcanon I also count Energy, water & wind

I actually thought that wind was Balance. Every SD should control only one element of creation.

Could you answer my questions? Would be sofort nice🥺