After the events of The Needs Of The Many, David returns to Equestria with his new bride, Savannah and is welcomed back warmly. However, it's not long before things go south as the Mane 6 start losing their souls from their bodies. Housing them in his own body, David must make his way to Princess Celestia in the Crystal Empire to set things right. But as a familiar evil is causing him to undergo a transformation (both physically and mentally) will he make it there in time? Find out in Host Of Souls.