He established it when he had control over me. While I rather not have anything associated with him, I must admit that the Underground still has it's uses.

[There's a pause as he wonders how to proceed to explain, as he doubts the questions will not form about Hyde. He not proud of it, and he still doesn't truly believe an essence can really reflect a person, but he has to live with it while in the Index. He looks to Edelgard, gesturing to himself.] The story behind my essence is a tale about the good and evil inside a person. Hyde, this form he usually takes, is suppose to represent that darkness.