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Gabriel Miller, also known as the "Subtilizer" in Gun Gale Online and Project Alicization, and temporarily known as Vector in Project Alicization, is the primary antagonist of the War of the Underworld sub-arc in Sword Art Online.. He is the chief technology officer of «Glowgen Defense Systems» and the child of the former president and founder of the company. He played Gun Gale Online (GGO) and won the 1 and 4 Bullet of Bullets tournaments on the Japanese GGO servers. He later directly commanded the assault on the Ocean Turtle and used the Soul Translator]] to enter Underworld, first as Vector, then as Subtilizer.


One day, his company was approached by the National Security Agency and they were requested to participate in an operation to assault the Ocean Turtle to obtain the Soul Translator technology secretly developed there. Hearing about the technology to interface with the human soul and that it had already succeeded in duplicating a human's soul, Gabriel volunteered to lead the operation himself.