Svirfneblin Son Missing is a side quest available when you arrive at the Underdark. * Therndle Daglefodd in the Svirfneblin village in the Underdark will tell you that his son is missing. * Go to the soul entrapment crystal near the center of the area and turn the second facet from the right to free Bedlen Daglefodd. * Return to Therndle Daglefodd in the village and he will reward you: 10000 exp, Bracers of Defense AC 4