Not all mods are texture upheavals or Bowsette introductions; some are massive, like the five-years in development Washington's Malevolence mod for Fallout 3. Helmed by a single modder and a gaggle of voice actors, the DLC-sized mod has been in the works for half of Fallout 3's lifespan—as it's approaching its 10th anniversary this month.
Yesterday, the "DLC-sized quest mod" called Washington's Malevolence was finally been unleashed upon the world. It takes place on Maddox Island in the Chesapeake Bay, as the player is tasked with finding the Rocky Cape Bank for treasure. The mod contains new characters (mostly voice acted), new locations, and more that can be shaped according to the player's decisions.
"This project has been a self-built labor of love for the past 5 years of my life. Without the help of a great team of voice actors, this project may have never seen the light of day," its creator Garfield2004B writes on the mod's NexusMods page. "(In fact, this project was stopped completely several times, the longest stretch being about four months, due to rocky events in my personal life. But enough about me!)"
As of now, the ambitious mod only works in the base game of Fallout 3, though it's designed like other official DLC where players can drop into the quest at any time. It's obviously non-canon, as is plainly stated in its description in big red letters. Also upon completion of the mod's quest, players will no longer be able to return to Maddox Island, though Garfield2004B alludes that maybe that'll be remedied in a future update.
On Reddit, Garfield2004B insists that A Tale of Two Wastelands (the mod that merges Fallout 3 with Fallout New Vegas' engine) compatibility is on their list of potential updates. In the meantime, Fallout 76, the big multiplayer endeavor by Bethesda proper, will be out on November 14.