A character who is known for slaying powerful or magical creatures despite having no special powers of his own.
Cousin to the Badass Normal, this is a character who inhabits a world where the average person doesn't have any kind of supernatural or magical power but magical creatures such as giants and dragons exist. You might logically expect that no sane person would dare to challenge these creatures, and in general you would be right, except... Enter the Mere Moral Giant Slayer (or Dragon Slayer, etc.) They have the tactical acumen to figure out how to kill a creature five times their size, the strength and stamina to pull it off, and the foolish bravery to go do it. What they don't have is a spellbook full of magical powers, a closet full of enchanted gear or supernatural protection; perhaps an heirloom sword that is entwined with their destiny, but the overwhelming bulk of their victory comes from their own strength and intellect. A staple hero of Low Fantasy stories, the audience can find the Mere Mortal Giant Slayer more relatable than other heroes. However, this naturally limits the scope of the world the story can take place in if the author is looking to avoid Fridge Logic along the lines of, "Why doesn't the hero just fly over the giant like he did the gorge?"