As the title suggests, I'm looking for a Manga that is dark, serious and gritty, something along the lines of Berserk, Monster, vinland saga 396v6q

I dont mind the story, whether it be magic, action, crime, ancient times. As long as the story and plot is good, I'm down for it. 😎

Might as well put some famous ones out there, but you've probably read a lot of these already given your current examples:
Skyhigh

Sidooh.

Shuto Heru

Heat, and other titles by the same mangaka.

I second Matsumoto Jiro works would fit your request pretty nicely.

Another author you might want to try is Kitoh Mohiro.

Endo Hiroki.

Soil is a good one, but it has quite the insane edge to it, so if you're looking for very realistic stories you may not enjoy it.

Possibly Homunculus, but, like Soil, it's bizarre -- though in a completely different way. It's also more on the introspective side, so there's no action at all.

Kiba no Tabishounin - The Arms Peddler
Dorohedoro
Rainbow (I'm not sure about this one, I stopped reading it early, it was too much for me)
Priest

Zetman as well

Edit: Until Death Do Us Part too

Kimi no Knife can get really dark. The main character is a hitman and its great.

Homunculus is just a mindfuck of a manga and super psychological. Its not so much dark as it is psychologically dark.

Both are pretty much my absolute favorites that I couldn't put down.

Why am I like this

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