Basically we're girls of the same line - so my mum in the dreams was one before me - who fight these demons who select to possess those who're truly evil. Usually serial kilelrs. They also pick others to give a bit of their essence to, to make them more powerful. I know my arrows are made of light, and they can burn the taint of evil from people. But demons, those I kill. Or send back to hell. Six on one, half a dozen on the other, I expect.