Black Tourmaline also aids in the removal of negative energies within a person or a space. Black Tourmaline will cleanse, purify, and transform dense energy into a lighter vibration. A popular metaphysical stone, Black Tourmaline is also great for grounding. It balances, harmonizes, and protects all of the Chakras,The door hanging will ward of negativity and evil. 

Disclaimer

Candles,Herbs,Crystals and essential oils are solely energy work and should not be completely substituted with conventional medicines and medical methods and it is advised to consult doctor if you have serious health issues