Board Thread:Speculation House/@comment-11188061-20131022124840/@comment-11188061-20131023023503

@XDex

XDex, I'm sure the Red Forest holds much significance, but likely not that much...

@Angren Ture

The Grimm are basically creatures who have lost their souls. 'Purifying' it would just kill them. If you want to return a Grimm into a living creature, I could see at least a few requirements that needed fulfilling:

1) The soul must be returned back to its own body.

2) The soul cannot leave the body for too long, or either the body will die first or the soul will lose its sense of identity.

3) The process of soul extraction may be different from returning it. Hence, a way must be researched to return the soul back to its original body, before the above requirements could even be thought of.

@ImposterParrotGrass

I've already written all the theories in 'The Speculated True History of RWBY', which answers your question.