Skeleton holding jar of ashes. Accesible with flying mount, or actually, you can jump down to him, but you cannot get back up from where you jumped. Check for yourself in Hellfire Peninsula [45.1, 87.2] and start wondering - what's going on? Is this really a part of Ashbringer quest line (joking). Maybe it's really a tribute to Tseric?

Jar actually holds readable text : Here is a jar of ashes. These are the ashes of my sanity, my passion, and my drive. All, utterly destroyed by themselves. May all those who look upon these desolated lands of Hellfire remember this fallen peon. He shed blood for the Alliance, and sacrificed for the Horde only to be driven utterly mad by the wicked and soulless ones who devoured what he held most dear. As they feast from his toils, may they suffer his wrath. Maybe not in this world, but in every world hereafter. It is my declaration, my solem oath, and my everlasting promise. I will avenge my suffering.