*aṣṭasenā (T. lha srin sde brgyad; C. tianlong babu 天龍八部), or "eight classes of gods and demons," are eight types of non-human beings associated with the sensory realm (kamadhatu). In Mahayana sutras, these beings are often described as being in attendance and listening to the teachings of the Buddha.
In the sutras, all of these being were able to receive and practice the teachings of the Buddha.
These eight classes can also refer to various types of mundane spirits who can cause either help or harm, but remain invisible to normal human beings: ging, mara, tsen, yaksha, raksha, mamo, rahula, and naga. On a subtle level, these eight types of beings are regarded as the impure manifestation of the eight types of consciousness.