List of dark, gory, mature, gothic, post apocalyptic, over 15/18 "mmos"? Hopefully free

[donatas081294]

The only ones I can think of are path of exile (arpg mmo), league of maidens (fan service single player with global chat), inquisitor martyr (lobby based "mmo" as it has some mmo-ish features) and now Requiem: Memento Mori.
But I am wondering what else steam has to offer in regards to either gory, dark, mature, post apocalyptic, over 15/16/17/18 (whatever the age rating system they are using), bloody, fan service, well anything and everything that would fit the mature vibe, style whatever mmo or mmo like style and hopefully free to play, free to download, or at very least I willing to buy to play. But no no for subscription to play or having pay to play (UNLESS it's really, Really, REALLY good).
So yea in short I guess anything that would resemble mmo with blood, guts, nudity, giggles and dark settings. (Doesn't have to have them all, but at least 1 of them).

PS. I hope this thread doesn't die or remains empty for months to come.

PS.ps I don't mind suggestions that are outside steam platform too.
(Any console only suggestions I hope they have pc emulators).

I hope I am posting in the right forum as quickly looking though them suggestion/ideas seems to be for the steam platform and not what's on steam. While steam community is just the community of steam. So Steam Discussions seems like the best pick. I hope.