Raseśvara was a Shaiva philosophical tradition which "arose about the commencement of the Christian era" (1st century CE).
This school was based on the texts Rasārṇava, Rasahṛidaya and Raseśvarasiddhānta, composed by Govinda Bhagavat and Sarvajña Rāmeśvara according to Cowell and Gough.
[2] Raseśvaras, like many other schools of Indian philosophy, believed that liberation was identity of self with Shiva and freedom from transmigration.
[2] Extrication of soul to Raseśvaras was a cognizable act and therefore, for liberation it was necessary to maintain an imperishable bodily life.
[5] Raseśvaras described eighteen methods of treating mercury—sweating, rubbing, swooning, fixing, dropping, coercion, restraining, kindling, going, falling into globules, pulverising, covering, internal flux, external flux, burning, colouring, pouring, and eating it by parting and piercing it.