You are fighting Jane; She's just a robot, so you can basically strike her at the core similarly to how you beat Mettaton; Realizing that she is created on August 15, that day is the Feast of the Assumption of Mary, and you realized that Mary go to Heaven and is now considered to be a being connected to Heaven, similar to how Jane is now considered to be an Agent of Reverence (YHWH) after she was injected with Reverence's blood and is brought to the surface, means that she "ascended" from her original birthplace, a realm that is supposed to locate "somewhere underground", and then awakens her divine powers, triggering the birth of a heavenly being
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