Hints in languages and how they relate, that one really seems to be English; what can breed with what; history. . . Hmmmm So, something like late age Shapers/Ousters drop Weirwood (terraformer 'gods') w/ Children o' the Forest, Mer folk, Giant, Draco etc neomorphs. 1 Megade (if Leaf corr) later a generational or sleeper starship dumps some Homo S.S. 1.0-1.2s, they spread. Tens 1000s later White Walkers made. Another 10k later Bran Stark born. Magic all psi & attotech. How Brust meets Pini! Or Gibson meets McCaffrey!