daveNYC wrote:As a hypothetical, say a DE moves to a craftworld, what whould have to be done about the Spirit Stone and would getting one stop the soul drain that causes DE to need witness pain?
The craftworlds have plenty of spirit stones. Every newborn gets one, after all. As for the soul drain, I believe it will help. But it probably also requires at least a partial adoption of the self-denial used by the non-Dark Eldar. Otherwise all of the Dark Eldar would be running around with stones as well.
And for the
OP's question -
Craftworld -> Corsair -> Dark Eldar
A craftworlder who chafes under the restrictions of the Path system will often join the Corsairs. Once there, it's easy enough to fall more and more toward the dark side until the eldar in question finally adopts the Dark Eldar philosophy.