Obsidian is considered the truth teller.  It exposes traumas and illuminates any falsehoods.  It supports you in the darkness or in challenging situations/transitions reminding you of the light on the other side.  It protects and cleanses from negative energy, provides strength and self-control, and is said to aid in detoxifying the body. Obsidian alleviates stress and identifies its root cause, protects yourself and your space, and is great for protection in a hostile work environment.