Drakengard and Nier, shame the gameplay in the former is so terrible.

Inquisitor. And keep an eye on Age of Decadence, if the game ever comes out.

Amnesia: dark descent is dark but mostly exploration and also I can slingshot some crap in gods face but I have trouble playing that game.

You mean Escape from Hell, which uses the Wasteland engine?

Uh...Darksiders and Baldur's Gate II come immediately to mind. And if you're willing to trust the fanbase, Neverwinter Nights has some mindblowing horror-themed modules created by the community that are small games in their own right.

I'm going to Suggest the Geneforge series. I find that they have some dark themes, it's about a world where the leaders play god. I also like that it's not the faux-gothic that seems to be all the rage nowadays.

Almost all western RPGs are "dark" and "gritty". Sadly, I don't think many of them are adult enough, but they usually have some pretty disturbing undertones if you pay attention to the story and the world.

Planescape and Fallout 1 (I felt that 2 was a little less atmospheric and a little more goofy).

The Shin Megami Tensai Series are pretty dark. It's split into several spin offs most notably the Persona and Digital Devil Sagas. The tvtropes link can explain it better than I can: http://tvtropes.org/pmwiki/pmwiki.php/Main/ShinMegamiTensei

I've only played Persona 3, but I am looking to try out more games in the series. In Persona 3, the main character discovers that there is a hidden hour of the day that is referred to as the dark hour. During the dark hour, normal humans are transformed into statue-like coffins, and monsters called shadows run rampant and attack the untransformed. Few people are aware of this hour and an even rare few have an ability called the "potential" which means they can a summon monster called persona to help fend them off. The game consists of the main character trying to unravel the mystery of the dark hour and Tartarus, a tower that the school transforms into during the dark hour.

Persona 3 opening: http://www.youtube.com/watch?v=BSsUH6M8xBg

Planescape: Torment is probably the most adult one I have played.

Neverwinter Nights 2: Mask of the Betrayer was more high fantasy, but still had some more adult themes than the other NWN games, and it certainly had a darker tone than most other Faerun based role playing titles.

Yes, Shadow Hearts with the Judgement Ring? It had (I think ) two sequels, Covenant and one whos name escapes me, I think it had an indian girl on the cover (been awhile), there were some great RPG's on the PS2 :) ...EDIT SH: From the New World.
Painkiller?
Darksiders was great, like a cross between Zelda and Soul Reaver, sequel is out next year I believe.

It was the judgement ring-game and I really just played the first. 2 times. It was really great, even after all those final fantasies and all other things. That was dark but still a weird sense of humour and a freaking solid game.

Hi,

On gog i think the following list of rpg games are pretty dark:

Darklands, Ultima 7, Vampire the Masquerade, Ultima 1 and 2 (without torches), Stonekeep, Betrayal at Kronodr, Realms of Arkania, Planescape Torment, Temple of Elemental Evil, The Witcher 1, Fallouts, Divine Divinity, Baldurs Gate 2, Gothic 1.

Not available on gog.com are

Dark Sun 1 + 2,
Elvira,
Darkspyre,
Darkstone,
Darkwing Duck GBA, (couldn't resist)
Conan 2004 version
Warhammer Dark Omen, dark strategy game with consistent units
Warhammer40k Gates of Chaos, turnbased squadtactic games with dark future theme,
The Dark Heart of Uukrul, cult oldschool game like Bards Tale and co,
Warcraft 3 RTS with heroes,
Baldurs Gate Dark Alliance,
Thief 1 and 2, no rpg stats but strong atmosphere, you are basically larping a thief,
Die by the sword, Action Game with nice combat system,
Syndicate (RTS),
Castlevania series, platformer with rpg elements,
Shining force, tb stratrpg,
Dark Messiah of Might and Magic, Might and Magic 6 to 9,
The Dark Eye Drakensang,
Dragon Age,monty python style splatter scenes and dark and gritty lore,
The elder scrolls Daggerfall, Arena, Morrowind, Oblivion and Skyrim.

Edit 2: Most games from publisher Atlus like Shin Megami Tensei, Persona series etc.

Happy new year.

orly?

No it's an isometric RPG. I know I've come across it at one point, maybe on an RPGCodex LP, but I can't remember the name right now.

-edit- Ah, found it. Apparently there's no girlfriend involved, and it uses the Wasteland engine, not the Gold Box games'. But yeah, pretty dark game. Also, for crying out loud, you can actually have Stalin and Mozart in your freaking party!