Bastard!! Heavy Metal Dark Fantasy.
It had some DnD stuff going on at the start and it was always just on the border of being a sienen. Despite the dark and gritty tone of the world and the events taking place it never took it self too seriously which ar first I found kinda jarring. Like, breaking the 4th wall while facing against monsters that ate literally killing everyone around them.
Im trying not to spoil here but when it gets to the later parts of the story when we see the ancient kingdom and how it was destroyed that threw me right off. I didn't expect any of that. I don't think I have ever seen a manga that actually has a plot tied in to the actual Christian Bible. Not some mythology that has loosely got some biblical inspiration or whatever. The actual bible. Being a Christian growing up in a Christian household I found that so sick
Sorry for rambling
I really would like to see more manga like Bastard though. The closest we have in jump in terms of the world is Black Clover since it's the only other fantasy I can think off. Though its norse mythology. And the closest manga to Bastard in recent times imo is Chainsawman cause they are both just barely shonen manga and are extremely hilarious without being a comedy and various other reasons... I'm gonna stop now.