Albert Dying

Albert Dying (アルバート＝ダイイング), also known as Tu, is the leader of the Guild.

Etymology
Albert's alias Tu is derived from the Roman god Saturn (サトゥルヌス), possibly emphasizing the difference between Saturn and the similar sounding but unrelated, perhaps linked to resentment at similarity from Roman worshippers as the spread of Christianity had them viewed as demon worshippers.

Background
At some point in the near past, as the Guild believed that Christianity's time had come and that it was time to act and move on as they had done so in the past, Albert and the Guild made preparations to bring about the end of Christian society. As part of their direct approach, as opposed to their indirect approach of secretly providing support for various magicians in Europe to cause incidents and chaos, Albert intended to acquire the Sickle of Saturn and deploy it in the center of the Vatican, the heart of the Roman Catholic Church. In order to acquire what they needed, he and the Guild carried out a series of thefts from various museums across Europe, including one in.

After stealing what he thought to be the Sickle of Saturn, Albert took the spiritual item to Brax Mizhine for appraisal. Wanting to earn a little extra money, Brax gave the item a false stamp of authenticity. Albert subsequently tried to carry out a ceremony with the fake item, only discovering the truth when the ceremony failed as a result. This resulted in him nearly being killed by a Necessarius squad, which included Stiyl Magnus (who would believe he had killed him), and losing many subordinates and resources. Afterwards, an angry Albert returned to execute Brax for his deception, dismembering his corpse and leaving the preserved pieces in his mansion's fridge. He and the Guild then resumed their museum thefts, with a total of seven known, to make up for what they lost and finish the preparations needed for their plot.

Toaru Majutsu no Index SS: Agnese's Magic Side Work Experience
By the time that the Anglicans attacked the Guild's base on, having discovered their involvement behind various incidents across Europe through Agnese Sanctis, Lucia and Angelene's investigation, the group's plan was ready to go and the main force had already escaped. A stolen statue of Saturn at the base was destroyed beforehand to prevent their enemies from finding out about the truth behind Albert's alias Tu and the role of the Sickle of Saturn in their plan. Although the Anglicans seized the Guild's records in the attack, they were initially unable to identify Albert as the Guild's leader, having no complete voice sample and only the alias Tu to go on.

Around the time that the Anglicans had discovered his identity and the nature of his plan after investigating the remains of the destroyed statue, the divined lead of the museum thefts and the disappearance of Brax Mizhine,    he had apparently stabbed the Sickle of Saturn into the ground at the center of the Vatican.

Abilities
Albert acquired a spiritual item known as the Sickle of Saturn (サトゥルヌスの鎌), based on the Roman equivalent of the of  (アダマスの鎌) which Saturn's Greek equivalent  used to castrate  and usurp his throne as the chief god (before being overthrown in turn by ), and the cornerstone of his guild's plan to destroy Christian society.

Acting as a large-scale field constructor, when stabbed into the ground the Sickle of Saturn can take over local ley lines and remake the surrounding area into the user's territory. It is described as similar to Croce di Pietro, which can Catholicize land it is stabbed into, but said to be worse, being able to provide 'foundation' to any land, cut it away from the surrounding land and apparently grant the user near-godlike authority. It will also apparently automatically search out and eliminate enemies and defiance within its territory, being said to be powerful enough to wear down the souls of unauthorized intruders to the point of death - the approach of slaughtering all who don't convert being noted as a way to rule fitting Roman Mythology. Given its use of the ley lines running through the planet, the sickle's location can cause the field to cover more than just a single town, with Albert's own target being the Vatican.