I'm not sure about it taking one to hell or slavery, but the repercussions are dyer if Kundalini Shakti (Kundalini energy) is not channelled properly. Practicing Kundalini Jagruti (Kundalini awakening) is not everyone's cup of tea. My father has told me that a lack of control (owing to either not abiding by the rules of practice and/or not in the presence of an experienced Guru) can manifest in very strange ways. We may become slaves to the energy if it's not channelled by proper methods and thus could destroy eventually, but I'm not sure about hell. Logically, yes if the energy flows upwards it leads to ascension to the next plane of existence i.e. Swarg (heaven), so downwards would suggest Narak (hell). Achieving a state of Samaadhi (spiritual enlightenment) is perhaps the highest point possible where one, becomes one with universe itself.