Below is the brief description of every Leviathan Axe upgrade: Moreover, you will also unlock the Worthy trophy once you have collected all 6 Frozen Flames.
Once you have gotten it from the chamber, simply head towards Brok or Sindri’s shop and carry out the trade. You can do this by going through the region where you get the treasures in center chamber of the workshop in Niflheim. For the last one, you will get it if you exchange the Niflheim’s Chilling Mist for the Frozen Flame. You will get each frozen flame by defeating the bosses as each boss drops a frozen flame when defeated. Now you can get the 5 out of 6 frozen flames required by going through the main story of God of War. In order to upgrade the Leviathan Axe, you will need the Frozen Flames.
