So what the heck is “strand cast” and why is everyone talking about it like it’s something we should all be familiar with already?
They talked about it in Chapter 7 when Kuiil theorized about what the child was.
It’s basically the SW equivalent of a test-tube baby or just generically engineered people/creatures in general. It was also recently canonized that Snoke and Palpatine’s “son” (Rey’s father) were strand-casts.