Yesod is one of the Sephirot that works for the Facility in the upper layer, Asiyah, and is the head of the Information Team. The player meets him on Day 6, after unlocking his first expansion of his Department.

Yesod's missions focus on work performance and completion, granting researches that measure information, such as  HP and  SP gauges for the agents and damage dealt.

Yesod's personality is strict, uncaring and logical, but sometimes, he limits himself when he 'overacts'. He examines each situation meticulously and logically, believing that emotions and trust for his employees are unnecessary. Still, he tries to keep casualties minimized through prevention. He has a complex hallucination that causes him to always stay covered up, not revealing much of his skin or body besides his own head. Any type of description of him by other workers, like 'devoid of emotions, cold-blooded...' are taken as compliments by him, because he believes that personally knowing someone or feeling emphatic can make his own employees exploit him.

If this Fandub continues, the chosen Voice Actor will likely also play Yesod in Library of Ruina.

This Voice Actor will also voice Gabriel.