I know how it sounds, but like, bear with me.

I (28/F/former paladin), had been travelling with a cursed greatsword (Immeasurable/F/Sword) and was really into her for a long time. When we first met she told me she was the disembodied spirit of an ancient warlord and beamed images of a beautiful raven haired warrior in gorgeous blackened Gothic armor into my mind, she told me it was her true form and I was super into it so I forsook my paladin oath and we started hooking up

Early on in our relationship she was really supportive when I started to transition, telling me she was "nearing her apotheosis" as well. I didn't think much of it at the time, and dutifully listened to her when she told me to travel the kingdom and assemble the ritual objects for her ascension. There was a team of adventurers that tried to stop us and she told me to kill them but one of them was my former best friend Sir Roderick The Bold (25/M/Paladin) so I refused and only incapacitated them. She didn't like that and we had a huge fight about it after we'd left

Long story short after I'd done the ritual and assembled the artifacts she revealed her true form was a ruse and she was actually just a mass of tentacles and eyes (which I don't mean to yuck anybody's yum mentioning, it's just that tentacles don't really appeal to me lol)

She said she was going to consume the world, "starting with you" and that I had "outlived my usefulness". I felt really shocked and betrayed and helped the adventuring party that was following us around to defeat her and seal her back in the sword (which I left there), but I feel really bad about it