>>119270624A Basotho tale, Nanabolele, Who Shines in the Night, had Thakane.
There's a few slightly different versions of the story depending on the translation but the following version has the elements common to all of them.
There was once a dude who was a pretty kickass warrior with a daughter and two sons. I think he lived in sort of a mountain retreat type deal. As fairy tale parents are wont to do, he drops dead at a youngish age (possibly literally on account of the mountain home) but not before she promises to take care of her brothers if they become orphans.
Despite his awesomeness, the dad had apparently trained his sons wrong on purpose as a joke so they were both useless tools. So Thakane teaches them everything she knows and tells them to get the hell out of her house.
They agree but only on the condition that she provide them with some awesome gear made out of the skin of a nanabolele, which is a glow-in-the-dark water dragon that murders everything in its path.
She calls them out for being stupid, they whine that their dad would have done it, and she says "Fine. Whatever." and sets out.
Thakane goes around various bodies of water and finally runs into an old woman that takes her to an underwater village after Thakane won;t just leave. The old lady is the only one left since this is now the den of the main nanabolele and its entire tribe after they ate everybody in the village. Well, except for her since she was too old and stringy to eat but could do housework and what-not for them.
Thakane finds the king nanabolele and swords it to death. The old lady thanks her for avenging the village and tells her to leave before the rest of the nanabolele wake up. Thakane tells her to come along but the old lady says she's too old to run and gives Thakane a pebble that might come in handy.