Board Thread:General Discussion/@comment-1487677-20160317043048/@comment-27565137-20160320025350

No. I don't believe it takes such extremes.

Has I see it, Oetsu most likely gathers Reishi from shinigamis. That reishi would have imbued in itself pieces of their souls. And all Oetwu has to do is gather the free flowing Reishi particles. Condense them and purify them. To leave no residual remnants of the shinigamis and then he creates the Asauchi.

To me this is the process that makes more sense.