Universe B (Jenny Everywhere and the Lord Hell)
From Jenny Everywhere Wiki
In one universe, Jenny Everywhere and Laura Drake were students. A version of Hell existed in that universe, including a region known as the Ratreyfian Underworld, ruled by Lord Grallyx.
Wishing to make a demonic deal to pass her history finals, Laura enlisted Jenny's help to summon Grallyx, using a spell found in an old demonology book at their local library. Unbeknownst to Laura, another Jenny, who was far less down on the demon-deal plan, shifted into Jenny's body partway through the ritual. She ended up defeating Grallyx when he went out of control upon being summoned. She eventually trapped him inside the demonology book itself, via its counterpart in another universe. (PROSE: Jenny Everywhere and the Lord of Hell)