The psychological dissection of a human's unconscious mind through the utilization of advanced oneiric technology to determine what nightmarish phenomena is affecting their mentality.
"He suddenly fell into a coma due to a hauntingnightmare he had, so we had to wait for the Oneiropsy report to tell us why he was having genocidal behavior."
aka Ruel van Dijk, the sweetest human bean to ever walk this earth. Also quite tall. Looks cute in bucket hats and literally anything else. Can be spotted dancing awkwardly, yet adorably, at any time or place. Or saying, "AreeeeeeeeeEeeeeE YOU REaaaaaaaaaAaAaAaaaaaal", as it is his famous catchphrase.