Board Thread:Character Discussion/@comment-13022928-20170908160639/@comment-13022928-20171106043423

Madi was most likely kept a secret by her parents. Also there is no way to become a nightblood it's something in a grounders genes that make them a nightblood. You can make someone a nightblood like Abby did with Clarke, but the grounders don't except a nightblood made through science as their commander.