It’s a story I ran across several years ago. It was something of a World of Warcraft setting, but with Inflation and/or Weight gain in it. It involves two female heroines tracking down some powerful Elven (blood elf?) mage that’s going around and inflating people, oftentimes with fatal results IIRC. There’s also an undead assassin also after this mage, although I believe he doesn’t meet up with the heroines until towards the end of the story.
It’s a story I originally read on DeviantArt years ago. I thought I had saved in my archives, but for the life of me I can’t find it, nor do I remember whom wrote it. It was also a multi-part story, and had at least three or four chapters, pssibly more.