The Witch Elf Ending is an Ending in Prisoners of the Elder One. It occurs after using the Transfigurative Orb on Rania.
Rania easily blocks the magic, redirecting it at Erik to turn him into a elven witch. She takes up Erik as her student, and after a few days, she's completely acclimated to her new body. After a while, Erik, now Eloen, saves Tiffany, even though her form is unfamiliar to the elf.