Need lesser known dark/violent anime suggestions!

I love darker stuff, I'm super edgy like a depressed teenager who hates his dad., lol

I love everything from the golden age of anime stuff like Wicked City, Demon City Shinjuku, etc.

I'm a huge Bersek fan (ughh, even the 2016 nightmare-fuel CGI abomination)

I've seen a bunch of stuff, like RIN: Daughters of Mnemosyne, Garden of Sinners, etc

Still haven't seen Monster tho....