Appropriately enough, Demons. Only encountered above ground, spend most of their time flying around above you, annoying as hell when they decide to dive-bomb you. If you're particularly unlucky, a Demon can even stunlock you by divebombing you while you're still recovering from being divebombed until you're dead.
And the Lurkers. They swarm, take up ammo, and can dive into their instant-kill rat-holes at a moments notice. They also scream loudly and unsettlingly, either screeching like bats, or roaring like lions, neither of which are pleasant at all.
In 2014, eastern Ukraine descended into civil war, which is probably one reason why the Metro franchise was temporarily put on hold after the release of Last Light. One aspect of this civil war is thatbullets are now being used as currency in the separatist regions.
The Russian aligned Donetsk People's Republic also has a special forces battalion named Sparta Battalion, named after (and using the insignia of) the ranger organization in the game.
Bourbon: Some call them demons, but I call them bitches.
It is actually a Narm Charm for a native Russian language speaker, at least in the respective dub. In Russian, Bourbon calls them Cykи (Suki), which means bitches. Cyka (Suka) is the singular.
Sometimes, you will hear enemy humans yell "DAMN! DAMN! DAMN!"
The death of Boris.
Stepan: BORIS! My friend! WHY?... The bastards! Boris, I swear on your memory - they won't rest while I'm alive!"
And yet Stepan doesn't mind that you loot Boris' corpse for ammunition and morphine.Considering how no one complained all the times you did before, it may be common practice.
The whole conflict between the Communists and the Nazis is loaded with narm. Even assuming that ideology can overcome the need for basic survival, how seriously the followers of each side take it starts bordering on absurd. It feels like both sides are World War IIWar Reenactors, only they shoot at each other with actual bullets.
Nightmare Retardant: You quickly learn that nosalises aren't big enough to fit in the narrow pipes the game likes to make you crawl through, and lurkers won't follow you in (for no particular reason), so these sections lose a lot of their tension. This makes one Jump Scare in the Lenin Library very effective, when a Libraran's arm reaches for you out of a side-vent.
The fine print on the anvil says : "War and nukes are BAD."
Another anvil more particular to Artyom's own story: "Don't try to destroy something you don't understand simply because you are afraid of it."
You're stuck in the middle between a war of Nazis vs Communists and both of them want to kill you as well as each other. "Political extremism and totalitarianism are bad whether it's far left or far right."
That One Level: The Library. There's a part where you're on a fetch quest, your enemies are Librarians, and there's no real sense of where to go because you may end up backtracking to the beginning of the section. Also, hoped you decided to stock up on ammo, because Librarians eat bullets like candy if you accidentally piss them off. Also, the entire level takes place outdoors, so if you didn't stock up on filters, it's a Timed Mission.
Visual Effects of Awesome: While the original game is no slouch on the graphical front, Redux uses the new 4A engine, and it look gorgeous.