Is it the colour scheme?
I sort of agree with you. While the Sea Elves disappeared in a puff of sea spray yonks ago, faint traces of them seem to live on in both the Dark and High quitters. The Woodies - being no strikes and you're out, insular, xenophobic types - probably avoided taint by sniping any interlopers from cover. That said, some of the tree spirits are pretty dark in the Middlehammer fluff.