Examine the tome in your inventory to read it. Although it is an inventory item, it does nothing in the game other than give you some lore. It does not even convert into a house item at the end of the quest. You may delete it at any time.
Visit Soul Eater Falls. The quest update is a specific spot located at ( 503, 26, -1512 ) /waypoint 503, 26, -1512.
Visit the top of N'Mar's Ascent. ( -397, 60, -1298 ) /waypoint -397, 60, -1298
Visit Bone Lake. The quest update is on the shore on the north side of the lake, at ( -866, 141, -2148 ) /waypoint -866, 141, -2148.