The Oracle's Chosen were told that, as part of their Three Labours, they must light the fires of the Mithral Forge once more.
So they travelled to the Forge deep within the Mithral Mountains mountains where they were confronted with multiple threats.
The first was the Troglodytes, who had taken over half of the forge. Freeing some captives from Clan Hukar, the heroes fought their way to the self-styled King Caliban. Made smarter by his Headband of Intellect, he tried to trick the Heroes; he failed, however, and negotiations turned into a fight soon after.
After spending the night with the centaurs of Clan Hukar, the Chosen travelled on deeper into the forge. Inside they encountered Cockatrice and Death Dogs, as well as a deadly contraption. Finally, at the lower level of the forge, they found what had driven away the Dwarves so many centuries ago: a Cerberus.
The dog was not the only inhabitant, however. The Forgekeeper, imprisoned for countless years, also lived here. With her help, the heroes defeated the Cerberus, though it came at the price of her freedom.
Luckily, she agreed to light the forge one last time before she left, and the Chosen were able to fulfil their prophecy.