Search The Down Below ( 441, -16, 85 ) Copy/waypoint 441, -16, 85 for a map to the Ratonga library - it's where the lowest level Bloodsabers congretate at ( 1, -2, -157 ) Copy/waypoint 1, -2, -157. Looks like a sparkling giant scroll.
Follow the path to the hidden library
Enter The Library of Vatheel ( -73, -0, -114 ) Copy/waypoint -73.43, -0.13, -114 - it's a sewer grate right next to the one leading to Vermin's Snye.