Somewhat unrelated, but I really wish we had more follow up on the vampire spawn. While this setting isn't directly based on any real life country/time period to an extent where such numbers are faithful, most raiding Viking armies held between 1000-2000 men. A sizeable Viking force was considered to be around 3000 men.
Those are 7000 spawn. Sometimes I wonder if the only humane choice unleashed a greater evil on the world. Small settlements like the Myconids we meet stand no chance.
If you talked to the Gur kids and Sebastian, you can find out, that the Gur actually take care of their kids again and Sebastian writes you a letter, that the spawns are doing fine in the Underark. He and Astarions brotehrs and sisters are helping them stay on path.