Quinella

Quinella is the actual ruler of the Underworld as the highest minister of the Axiom Church.

Background
She was born 350 years before Kirito enters for second time to the Underworld, she was the product of a political marriage between strong families at that time, her father was the lord in charge of the, at that point, Town of Centoria, and was the one who gave the Sacred Tasks, to mantain power in the family he created and bestowed upon her a new Sacred Task: Sacred Arts Research.

She discovered new sacred arts that the other Underworld Residents didn't know, she even discovered the Thermal Arrow command, and discovered that if you kill any other living being, your stats will rise, so she scaped every night to hunt nearby animals and rose her stats at an incredible rate.

Taking advantage of her knowedge, she made people believe that she was gifted by gods, and took the oportunity to start creating the Central Cathedral, and with it, the Axiom Church. She created the Feudal System in the underworld by making the lords into nobles and thus creating a structure to control the entire Underworld.