Vajrasattva is a bodhisattva in Mahayana and Vajrayana Buddhism associated with purification and the removal of negative karma. In Tibetan Buddhism, Vajrasattva is known as Dorje Sempa, which means "diamond being" or "diamond mind".
Vajrasattva is often depicted holding a vajra in his right hand and a bell in his left hand, symbolizing the union of skillful means (upaya) and wisdom (prajna). He is usually depicted in a white color, which represents purity, and sometimes adorned with a five-pointed crown, symbolizing the five Buddha families.
In Vajrayana Buddhism, the practice of Vajrasattva meditation and mantra recitation is a common method for purifying negative karma and purifying the mind. This practice involves visualizing Vajrasattva and reciting his mantra, which is "Om Vajrasattva Hum" or "Om Benza Satto Hung" in Tibetan. The practice is believed to help practitioners purify their negative karma, obscurations, and delusions, ultimately leading to enlightenment.