Seek out a Thexian scholar who can interpret the book for you.
The scholar's name is V'Aevic Eil'Dragis, he's in his Secret Lair ( -513, -91, -678 ) /waypoint -513, -91, -678 at the end of a small stream in the Grobb faction area of Firmroot Moot. NOTE: You may wish to consider putting down a rally banner if your guild has that amenity; there is a lot of back and forth to this instance with no efficient means of transportation.
Examine a headstone in Befallen: Cavern of the Afflicted ( 79, -31, -2 ) /waypoint 79, -31, -2 to spawn the skeleton Lrodd Level 80 ^^^, is not aggro. Kill for update. (His level scales to the level of the zone. Mentored to level 59 when entering caused him to spawn as level 59 ^^^) The Headstone is at the bottom of the well, just look southwest once you are down.
Kizdean Gix is a 85^^^ Heroic. Kill him without killing any of the adds he spawns or he'll become invincible. Adds will spawn at every 20 %. A chanter is recommended. Zone-In at ( 159, -49, -739 ) /waypoint 159, -49, -739