https://www.nexusmods.com/darksouls/mods/1524?tab=description

Dark Souls: Daughters of Ash is a massive re-imagining and expansion of Dark Souls. It features new bosses and enemies, new characters, new storylines, new weapons and items, expanded lore, and plenty of new secrets. It offers modified and brand new content, much of which cannot be discovered in one play-through.

Experience a new adventure in Lordran. Your journey will be familiar in some ways, and very unfamiliar in others. Expect to encounter:

New game progression
Forget what you know about exploring Lordran. New world-changing events, key items, and unexpected pathways await you.
New bosses and enemies
Triumph in new boss battles, most of which are designed to promote novel gameplay rather than sheer increased difficulty. Encounter new enemies on your journey – including enemies restored from cut content – and watch many old bosses and enemies behave in new ways.
New NPCs and storylines
Meet new characters with brand new questlines, which will intersect in numerous unpredictable ways as your journey continues. Even the stories of familiar characters may take unexpected turns.
New weapons, items, and mechanics
Discover new weapons with brand new abilities, many of which will require keen insights and careful consideration to master. Most existing equipment will not be exactly the way you remember.
Expanded lore
Learn more about Lordran's past from new item descriptions and gameplay events. (All new content is written to build upon the lore of the original game, rather than conflict with it.)
New secrets
Don't expect to come anywhere close to unveiling all of the game's hidden content in one or two play-throughs.

Daughters of Ash has more content than the original game, much of which cannot be seen in a single play-through due to the complex interactions between storylines. It contains no new game assets (e.g. character models, map assets, dialogue recordings, visual effects) but accomplishes a great deal through modifying the game's event scripts, placement data, and entity logic. It was created with more than one thousand hours of work throughout 2017 and 2018 by one very masochistic programmer (hello!) with the wonderful tools and loving support of the Dark Souls modding community. See the screenshots for examples of sights you might encounter in the first ten minutes.