OOC: As far as I can tell the Black Library is seperated into how dangerous the material within could be. Writings on Chaos, technology and foretellings would be in another section. here is everything that the harlequins are willing to let non-Eldar look at, it would be histories, stories, myth cycles, marine biology of the planet Kaurava IV. Interesting, and intriguing but no univeree breaking secrets here. Its not only Eldar writings its the writings of every 40k race over their timeline, translated into Eldar and Vice versa, though the Eldar would have a holo translator on it.