Hm, but in this video says that red eyes and tattoos are an exceptional feature of the Drow Lolth. Is this something new? It is interesting in new lore there is not a word about Eilistraee. But there are some Drow who are hidden by the magic of illusions.
That is something new indeed.
I am torn about the illusion argument, because I've read that it is near impossible that something as big as settlements in the UD should have managed to remain hidden when much more narrow and difficult areas have been revealed in the meta lore - AND, the illusionary magic should have been disrupted during the spell plague - as far as I've heard. Someone may correct me if I misunderstood something...