User blog comment:Tyrant0/a theory with legandary godzillas atomic breath/@comment-7622429-20141109140548

I don't know about that. In the novelization, the new atomic breath is a concentrated plasma stream powered by Godzilla's atomic energy. So, it's only an "atomic" breath in the sense of the power source. Unless Legendary retcons this with a different explanation in the sequel, this is what we have for the current atomic breath so far.