Damn I feel sorry for Darkne.
She was betrayed (although we don't know the reason yet) by the guy she basically raised, which caused her entire family to get killed and her nation to get destroyed, then she got imprisoned for 50 years and while the humans see her as some kind of dangerous monster, her own kind views her as a traitorous coward.
I do wonder what she exactly wants though, because it doesn't seem to be revenge.