Jesus Christ. Silent Hill doesn't have monsters as disturbing as that, and I'm including that thing that has it's own head for a dick. Now to be clear, this is pretty much as hardcore as it gets. These are creatures from a $400 board game in which you can wear the skin of your enemies as armor and roll dice to mate. One reviewer summed it up by saying it was life-changing, yet disturbing to the core and offensive to anyone with a pulse. Basically, it ain't for everyone.
If you're looking for something adult and familiar that won't make your friends suddenly remember that they have other stuff to do, note that a shelf-full of video game franchises have already made the jump to board games. The Witcher, Bioshock, Assassin's Creed, Gears Of War, X-Com, and the upcoming games based on Dark Souls and Doom have all successfully transferred what made their games great into a plastic version.
Now when you die 500 times in a row, you can flip the table instead of throwing a controller at your TV.
Like gritty TV? Game Of Thrones has been turned into multiple board games. Dexter, a show about a serial killer, has a goddamn game. But are these popular? Oh, quite so. Kingdom Death: Monster (you know, that game with the Cthulhu rack) recently raised almost $12 million on Kickstarter, becoming one of the most popular projects ever. And 11.5 million of those dollars went to more monster boob.
If you're looking to ease back into the cardboard world without dropping handfuls of Benjamins, your best bet would be party games. (Which, ahem, my game happens to be.) These are perfect to pop open at a crowded gathering while imbibing alcohol. In fact, thanks to successes like Cards Against Humanity, "adult party games" are now their own mainstream genre. Many classics that you may have played before, like Taboo and Outburst, now have dirty versions that would piss off your parents way more than you knowing the second verse of Eminem's "Without Me." And this stuff is mainstream. Adults-only games like Monikers and Nasty Things are sold right on the shelf next to Candy Land at Target.