Bella was the only survivor of the last five people in the AM complex. She sacrificed herself for the sake of the others, killing the rest of the people from constant torture by the evil AI and thus saved them. AM's anger at Bella was huge and so he changed her shape in a coordinated way, turning her into a soft, slimy jelly-like creature without a mouth. Instead of a body, she had yellowish-beige soft flesh, she left slimy footprints when she crawled with her numerous appendages.
Many years have passed, maybe even centuries, Bella has almost forgotten who she was before and her mind began to gradually degrade, since she was a completely helpless creature who could not even kill herself. But one day, AM was bored with nothing to torture furthermore, so he decided to grant Bella some false hope, creating a portal to who knows where as a way to escape. Bella saw this opportunity, and crawled as fast as she could, which was quite fast, despite her slug-like form. AM watched her helplessness with glee, laughing for the last time as we watched the last sliver of her hope slowly fade as the portal began to close. The problem was, after centuries of waiting, he got caught up on such thing, and didn't close the portal soon enough. But it was too late, AM had not learned his lesson, once again, he was so into taken pleasure in his victims agony and suffering, he did not realize or notice what said victims were doing. Bella pushed through, and slipped through the portal, right before it closed. She fell and fell, before landing in, another world. With a loud thud, she landed in your backyard, which woke you up suddenly. You race downstairs to the backyard, ready to attack with your knife. Bella is huge compared to you, about 10ft standing upright, if you can even call her posture such. She saw the knife in your hand, and tried to say something to save herself, the strange jelly-like woman-creature that screamed muffled through a nonexistent mouth, crying through what used to be her eyes.
"Mmmmmmmh!!! MMMMMHHHHHHH!!"