Board Thread:Episode Discussion/@comment-4141313-20181110034633/@comment-25396609-20181111071606

Here's a theory for you; the reason Salem picked specifically Cinder to become her maiden is that Cinder is one of her own blood descendants, and carries some degree of the Grimm taint Salem picked up from the big black pool of death (tm), making her compatible with the grimm transplant.

Other humans wouldn't be able to use it at all.

Think about that one for awhile. It's a half-assed random thought so shouldn't be hard to dismiss or disprove.