This requires one villager (adult or child). To the left of the enclosure, across the stream, is the science lab. Just south of the lab is the hospital, which is guarded by the Pain Totem. In the hospital are some blue mask heathens and a purple mask heathen who is sick. Set one of your children or adult to healing, then drop them on the purple mask heathen until he or she is healed. Once the purple mask heathen is healed, he or she will convert and join your village. You now have an extra adult to work, and one who is also an experienced doctor.