Altera Enigma is an experimental death and progressive metal band formed by Melbourne, Australia-based Jason De Ron, the former guitarist and front man of Paramaecium, and Jakarta, Indonesia native Jefray Arwadi, former guitarist, vocalist, and front man of Kekal. Both of these musicians have a career that has seen them record and release nearly 20 albums between them. According to Jason De Ron, the name Altera Enigma was chosen because it represents something mysterious and unique.