I will put them under Fantasy Apocalypse, they probably fit that category.
You should edit the entry a bit because
@Mohamed2001's post, although informative, is a bit spoilery too.
That being said, you could add Demon's Souls there too, since it too is a fantasy apocalypse. Generally, all Souls games (not sure about Bloodbourne, but I think that one too) have fantasy apocalypse as a major theme.
Edit: Command and Conquer Tiberium universe is post-apocalyptic. A lot.
From the second game onwards the world is basically ravaged by an alien substance and turned into a huge radioactive, toxic, uninhabitable wasteland, with pockets of civilization struggling here and there and even smaller pockets of humanity living in luxury.
And several wars have been fought over the said substance, on one side being global government basically, and on the other a religious, terrorist cult led by a mysterious, messianic figure.
It's only the first game, Tiberian Dawn (1995) that doesn't fall into this category, but is marking the beginning of the apocalyptic events.
If you look past the whole B-movie thing that's going on in the cutscenes, these games are very bleak and post-apocalyptic to their core. Rare PA RTS example.
I should probably note, however, that 4th game isn't worth a second of your time.