The closest thing I can relate to Berserk is Claymore. It's a Dark Shounen that really ought to be a Seinen. It takes place in a similar medieval time period, with monsters called Yoma that are monsters that feed off of human guts. There's heavy violence and gore and occasional nudity, just like Berserk. The main character Clair even wields a giant long sword like Guts. The makn character also has a sort of "curse" like Guts that needs to be kept in check otherwise Clair loses control and can expect to be killed, and she is seeking revenge against a certain character much like Guts to Griffith. There's a great deal of obvious inspiration taken from Berserk in Claymore. It's nearing it's end but is still a monthly ongoing series, with as of now, about 142 monthly chapters out already. I reccommend it to anyone that likes those darker themed manga. The only major difference between Claymore and Berserk is the huge female warrior Pressence including the main character, vs Berserk which has them but like most battle series is predominantly composed of males. But don't worry, there's not an ounce of Girlyness to Clair's attitude and there are male warriors in the series.