Interesting, I wonder how the whole light thing affects them? I know there has been a lot of stuff recently about Vitamin D and bone density. What dietary sources of Vitamin D are they getting as well as how would months of no sunlight be handled as the generations go on?
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."