Are we counting old-school expansions as DLC? If so, then, aside from the infamous Horse Armor, the Elder Scrolls series seriously raised the bar for what to expect from RPG add-ons. Tribunal and Bloodmoon were massive expansions that set the standard early on.
Knights of the Nine might’ve been a bit weaker, but Shivering Isles is one of the GOAT expansions and is arguably better than the base game.
Skyrim kept the momentum going with Dawnguard and Dragonborn, both of which added tons of new content.
The series is straight-up GOATed when it comes to expansions that are actually expansive: new locations packed with quests, items, monsters, spells, etc. They take already huge games and somehow make them even bigger.
No. You could argue the system that brought him to power is though.
A system that's sole purpose is to empower a few kid diddling degenerates. A system that has been intentionally perpetuated by those who embody the worst aspects of human nature. Those who prostrate themselves at the alters of greed and power. Those whose actions are driving our whole species to destruction. The plots and gears of this system were well in motion before any of us were born, and the window to stop it before is destroys us all has passed. The system is biological life's self-destructive nature made manifest.
In the end we are naught but mere animals. Like all other animals in a system where there are no natural predators and they are allowed propagate unrestrained, it will inevitably lead to the collapse of our ecosystem. We are just deer without hunters on a global scale. Cursed to be clever enough to realize we have brought about our own destruction, but not clever enough to stop it.
A Cosmic Doom has come for us all. The universe will go on without us.