Name = psa 'soul/life' + tha 'god'. Classed as a cosmogonic deity of the 'gods without image' group. No material cult-image is attested (imageless by definition); no kin attested — see SOLITARY flag.
Domains
soul and life force
the dead and the ancestors
Powers
grants the breath-soul (psa) of the living and keeps the souls of the dead
grants the breath-soul (psa) and keeps the souls of the dead in the world beyond
Sources
Standard survey of Circassian paganism / Religion in Circassia (Psetha among the imageless cosmogonic gods; god of life and souls).
Amjad Jaimoukha, The Circassians: A Handbook (Curzon, 2001) (Adyghe belief in the soul psa and the immortality of the soul).