So, Dark Souls gets a INAPPROPRIATE FOR ALL seal, right? Is it really that bad? Let me tell you, it isn't. Sure, there's plenty of scary and gruesome monsters as well as a topless(albeit not nipple-revealing) spider lady and Princess Gwynevere(who simply a giant lady with a revealing outfit) but it really isn't that bad. It's a really fun game too! Even though it's really hard, it isn't unbeatable, and, while I myself have not beaten the game, it's pretty fun for me.
Anyway, to the point. Dark Souls, compared to its inspiration, is as tame as Dora the Explorer. What is its inspiration, you may ask? Why, nothing else than the manga Berserk, which is, by all means, inappropriate for anyone under the age of 18. If you want to know why, you can find out. But I warn you, it is the most gruesome, ugliest, darkest, and scariest fantasy world to my knowledge. Even Westeros is less grim than it. That's just how terrible it is. However, if you really want to, you can look for it. Don't say I didn't warn you, though.