Obsidian removes blockages and debris from past lives and reverses previous misuse of power. This stone blocks psychic attacks and removes negative spiritual influences. Obsidian brings deep-seated emotions and issues to the surface.
This works extremely fast so make sure you are pairing this with other crystals to help you through issues that rise to the surface.
 
Hexagonal shaped crystals are used for protection and cleansing. It symbolizes strength, protection, and helps balance opposing forces. 
It can Also be used as a pendulum. Which assists with finding answers in a ritual called pendulum dowsing.