The Mark of the Dwarves is a power that permanently increases the Leviathan Axe’s stats in God of War. Brok and Sindri give you these permanent buffs during the game, but they don’t really explain what it is they’re doing.
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When you meet Brok the first time in God of War, he’ll offer to improve Kratos’ ax. All he does is give it a quick strike with a hammer, and you'll see text on the screen that reads “Mark of the Dwarves added.” Unfortunately, Brok (and later Sindri) aren't too forthwith about what the Mark of the Dwarves does. During certain parts of the story both of the Dwarven brothers will take a stab at your axe. A simple hit with their hammer appears to improve its power as you are granted a Mark of the Dwarves. You may think this is a Rune or something you can equip but it's actually a passive bonus that is applied permanently. If you access the menu and scroll over to resources, you can check out the description for Mark of the Dwarves under the Special Items tab. The description lets you know that the mark permanently increases the Leviathan Axe’s Runic stat by 1. You'll get multiple marks through the game and their effects stack. For each Dwarven Mark you get, it increases by 1.