A drubchen is a traditional form of meditation retreat in Tibetan Buddhism that lasts for about ten days. It involves a large number of lay and monastic practitioners and is led by at least one High Lama. It is regarded as a very powerful practice, and is said to act as a remedy to the negative forces at work in the world, and to promote inner personal peace, peace within the community and world peace. In addition, the lamas present sometimes also prepare large quantities of a herbal medicine known as dutsi, which is said to promote physical and spiritual wellbeing.