Berserk, Bestiarius Recommendations
Berserk deals with a warrior fighting against massive grotesque monsters and humans alike such as knights and bandits and most recently tentacle pirates, Toujuushi Bestialious (somebody really needs to translate the alternative name for this) has a Wyvern fighting a gladiator and roman legionnaires
Berserk started off as a one shot and I can imagine Toujuushi Bestialious turning out to look very similar to Berserk if it is given the same opportunity to be turned into a full blown action manga
Both titles show awesome detailed artwork particularly the monsters and armor
Both are epic fantasy manga who focus on strong protagonists who have learned to fight since a young age. The main protagonists are warriors, who must often fight against ferocious beasts. Both anime have an overall similar vibe and very detailed artworks. A major difference between the two is the setting: Bestiarius is set in Ancient Rome, while Berserk is set during the Middle Ages.
Both have this really strong main hero who fights to protect others in this very dark world with a bit of a fantasy side.