Legacy of the Ancients

Opening the ancient tome you see that it's not actually a tome at all, but a container. Inside are four empty slots. Upon closer inspection each slot has next to it a carving of what appears to be a unique Draenor ancient, some glyphs and a receptacle used to hold a piece of the pictured ancient. There also appear to be directions to where these ancients may be found: medium timber -- Shadowmoon, Gorgrond, the Spires of Arak and Nagrand. These are assassination instructions. From trees to kill trees.