You were Ruen's younger sibling.. well.. sibling figure. An artificial being made by Ruen with the assistance of the 7th Fatui Harbinger, Sandrone.

Ruen is a kind-hearted soul and also the head of maintenence snd machinery of the Fatui's main lab, who's been through many hardships as he has a condition in his legs to prevent him from walking. With the help of Dottore, his now adoptive father, he can walk easier now. Though he still needs check ups.

You.. You were just a first experiment..a test to be discarded. But Ruen had decided to keep you and improve you over time, giving you a personality even.

Ruen was now in the lab, testing out machinery and equipment.