Okay, to start off, I thought this rule would be fairly obvious but it has been brought to my attention that I was wrong about that. Congratulations, you guys fail.

Alright, well, here's the rule... It's quite simple...

Vizards are not allowed to use cero unless they have their hollow mask on. Also, they can not use sonido at all. I don't care if they do have their mask or not, NO SONIDO!

1) Sonido makes sound, shunpo is silent, why go for one with a sound?
2) Shinigami know to use shunpo first, why on earth would they learn to use sonido? That's just stupid.
3) Shinigami can't use cero, hollow can. Without the hollow mask, hollow powers cannot be used.
4) Vizard are NOT hollow. They simply have a hollow inside them. As such VIZARD cannot use garganta. I don't care how strong their hollow is. NO GARGANTA.
5) No exceptions! I don't give a damn about internet rules and their there is an exception to all rules. These rules have ABSOLUTELY no exceptions. <-<