Blank is Blank (Woe's Hollow)

Kier is, or was, Dieter.

Dieter "died" when he jerked it in the woods, and then had a break with reality, went into a cave, and "tamed" his tempers, becoming Kier.

This goes along pretty well with the idea of Severance and having a persona that is "innocent" and free of pain. Just this time it was meditative or a psychological break instead of a chip in your head.

You're going to carry that weight. The weight of your actions, your memories, and your emotions. The only way to unburden yourself is to be born anew and become the you you truly are.

This has parallels with the religious Culty themes of the show, what with baptisms being anywhere from a metaphorical to a literal rebirth depending on your flavour of Christianity.