Board Thread:Theories and Speculation/@comment-294840-20170617143219

Could Crystal Release be a Kekkei Tota? Considering that crystals are formed in nature when minerals (earth) dissolved in water stick together followed by the evaporation of the water it only makes sense for the water and earth nature to be a part of it. However, we already know that earth and water natures combine to form wood release. To top it all off, earth (of which the anime highly implied was one of the natures in Crystal Release) has already been combined with every other nature. This would suggest that Crystal Release combines at least three natures. For the third nature my guess would be wind playing into the evaporation aspect.

Yes. I know this is currently non-canon but they could make it canon in the future 