Skull candles are a form of sympathetic magic and are used to sway other people’s thoughts and perceptions. Skull candles against an enemy can be used for vengeance, to confound an adversary, or to persuade someone to leave your life or the lives of others. Make your enemies mind filled with confusing thoughts that constantly distract them, especially helpful if they have been working against you.
Baneful skull candles can also be used as an offering to call upon Santa Muerte, asking her to bring misery to your enemies. If you are looking at it from the perspective of traditional witchcraft, The Celts believed that the soul lived within the skull. Use that concept to reach right inside your target.
Fill another with negative and baneful thoughts until they confess a crime or make right a wrong.