Virus

Viruses
The standard name is the "Symphonic Information Virus." They are created in the tower, and can travel through symphonic lines, a network that runs throughout the tower. The more advanced viruses can use Flip-Flop Conversation technology and can infest the real world and can physically harm humans. Lyner and the Knights of Elemia are called out when these viruses become reality.

Most of the time, viruses come out of a place called the "Altar of Apostles." Since viruses are programmed to harm humans, whether they manifest the real world or not, they are usually hazardous to people. In the case that they do not become tangible, they invade the guardian of the tower and take control of them to attack people.

Human Viruses
Viruses that take one a Human form and have emotions, they can go against their original programming. So far only two have been show, Ayatane and Kauron(Ar Tonelico~Arpeggio~)