At least in the new testament, I can only find justification for divorce between a believer and an unbeliever, and in the case of an illegal marriage (most say adultery in these verses). An illegal marriage could be a marriage that follows after a divorce, for example.

For people facing abuse of whatever kind, would they not be married to an unbeliever? Or maybe I should better say to an unsaved, since even the devil knows that Jesus is the Son of God? In any case, the abused have other options I think, that do not include divorce. You can put a safe distance between you for example. You might be able to get a criminal conviction and have the spouse (notice I don't say husband here) incarcerated. Maybe that abuser will come to know the Lord through your walk in Christ.

Christ did not divorce us when we shoved Him up the hill and nailed him to the cross. He continued to love us unconditionally. If abuse and cruelty were biblical grounds for divorce, it would be advantageous to me, but nowhere can I find that to be true. Instead I find that our Lord wants me to love and to serve my spouse unconditionally, that person to whom I pledged my life until death do us part.