In the bad ending of the game, you bomb some volcano looking region of the city with what looks like nukes to kill the dark ones. Got lots of questions about that. Why was that area glowing red? Why were the dark ones thought to be there while during the game they were quite close to human settlements? Or if human settlements are under that red area, doesn’t bombing it also harm the humans? And why exactly was the objective bombing the dark ones while nosalises were shown to be the main threat to humanity? If polis station had accepted helping, would they also bomb the red area? I was under the impression they’d come to Artyom’s Station and protect it manually. Also if those missiles were nukes, won’t that just create more mutants? Are these ever explained in the game or the books?
The nosalises were added to the game because shooter games need generic enemies to shoot. They don’t exist in the books, so the actual plot doesn’t mention them.
In the book I don’t believe they were nukes, just described as a pre-war missle silo. They fire 4 into the gardens, it’s pretty clear in the games that the gardens and surrounding area are the home of the dark ones, they live really right on top of humanity. I haven’t played last light tho so I’m not sure about anything else.
From what I understood, the gardens were, like, their headquarters. Bombing them would be their Achile’s heel.
Indeed, as @FunderPants said, Metro Last Light should answer some of your questions :D
