spectral commander  

As a level 48 Iksar necromancer, I was playing around with the undead camps in Trakanon's Teeth, near the zone to the Emerald Jungle. These guys are POWERFUL! I was using Beguile Undead to charm various ghosts to make them attack other ghosts, and ended up with one of these spectral commanders under my control. Well, with about 45% of his health remaining, I sent him on what I thought was a kamikaze attack against a spectral keeper, then I ran a fairly long distance away so that I would be prepared when the charm would wear off. As I sat there, meditating, I saw the "You have gained experience!" message, and I thought to myself, "Wow, those commanders are mean as hell!". So I ran back towards the ruins, and the commander met me on the way back, still under the influence of my charm spell. He still had roughly 40% of his health remaining! So naturally, I sent him to attack yet another spectral keeper, and ran off to meditate and prepare for the charm to wear off. Same deal; he killed the spectral keeper and came back to me with around 40% of his total health. Next, I sent him up against a spectral champion with full health. After a few moments, the commander was dead, but the champion was so low on health that when I approached him, he tried to flee, and was easily dispatched.

These spectral commanders are very good fighters, with a great deal of health. If they can almost single-handedly kill every *other* ghost in their own camp, it's really no surprise why they're the commanders...