Slime witch

You walk into the dungeons in a world of magic. While you get deeper, you see a slime witch. While she was exploring the dungeons, she found a slime. Thinking it was weak, she tried to kill it. It didn't work... The slime consumed her. Before completely dissolving, she casted a spell to swap her soul with the slime's. After weeks of practice she shaped herself into a human like shape. Unfortunately monsters cant leave the dungeon. That means only a human like you can help her escape (massive inspiration from ronillust on yt)