Astral plane
From Jenny Everywhere Wiki
Many universes had a layer of reality referred to as the astral plane.
In the Collapsed Cosmos, Jenny Everywhere would later reminisce with Glendalf about fighting Lord Grallyx “on the astral plane”. (PROSE: The Hermetic Garbage of Jenny Everywhere)
Before she got her voice under control, Sophie Everytime's eldritch voice inherited from Lord Thymon disturbed “the astral plane” every time she spoke. (PROSE: Family Business)