Melina's server calculation foundation came from the undead Ouija.
By modifying the undead Ouija, she allowed the Ouija to represent and process data, commands, mental magic, and Doctrine power in binary form. This system, coupled with undead souls possessing a certain degree of "artificial intelligence," allowed some of the Banshees' complex demands to be met.
Selina critiqued it for a bit, grabbed some lunch, and holed up inside the server by herself.
Chapter 496