Doug Rubble was a Dao from The Elemental Plane of Fire, who asked for the assistance of The Tower of Grey in procuring some Brine from the tank of a Mind Flayer Brain. In exchange, he would tell them where to find The Sorrowful Man. They agreed to these terms, and helped him defeat it. This granted him the drugs he needed (did I mention the brine was for drugs?), and gave them a token to fight the Sorrowful Man, and gave Toby a Ring of Mind Shielding. Then peaced out, never to be seen again...