There are many God of War 4 students who still don’t know how to upgrade Leviathan’s Ax in God of War 4. Here is the “Sharing of Upgrading Leviathan’s Ax in God of War 4” collected and compiled by the editor of Sourcecode.com. Interested children can take a look. Take a look, I hope it helps you.
"God of War 4" Leviathan Ax upgrade method sharing
Upgrading the Leviathan Ax to level 6 unlocks a great value for money achievement, and the final upgrade is only available after beating the game.
The ax can be upgraded in any shop, and the required material is "Frozen Flame".
You can get the frozen flame by killing the BOSS in the main process. Don't worry about missing it. If you forget to pick it up, just look for it on the "Lost Items" interface in the store. When you first clear the game, the Leviathan Ax can be upgraded up to level 5.
If you want to upgrade for the sixth time, you must go to Niflheim, spend 5,000 Mist Echoes to open the treasure chest in the workshop, and get the "Icy Mists of Niflheim".
The requirement for the trophy [Darkness and Mist] is to obtain all the treasures in Niflheim, so we have to keep grinding in the Niflheim maze until we accumulate enough materials.
After getting the "Icy Mists of Niflheim", go to the shop and exchange it for the last icy flame, and then you can upgrade the axe.