The Nāth Siddhas are North Indian yogis with tantric associations who claim guru Gorakhnath, their founding adept, to be an incarnation of the god Śiva. They strive to obtain the eternal body through a regime of yogic practices, which are aimed at transmutation of sexual fluids into elixir. The masters of this yoga are the siddhas, the possessors of the siddhis, which are occult powers that...