Hell on Earth
The various modders out there are consistently able to take the Fallout franchise and give you something radically different within an overall familiar framework. Hell on Earth is one such entry, essentially giving you Silent Hill with the New Vegas style.
This (not lore-friendly, obviously) mod has you traveling to another dimension to try to track down lost mercenaries who went to investigate a nightmare realm. Hell on Earth really plays up the dark and bloody aspects of the franchise and manages to create a survival horror vibe even when you are gunning down monsters with a laser gatling.
Published Jun. 7th 2018