Kratos will be able to use a number of different shields in God of war ragnarok. But not all are available from the Huldra brothers. So if you have a playstyle that favors defense over offense, here's the location of all the shields in the game.
Before starting it is important to say that it is impossible to lose these shields. Yes, because they can be obtained both during the main storyline and during free roaming, after the adventure of Kratos and Atreus. Also, the first three are obtainable from the blacksmith, while one of them can be found inside a legendary chest.
From this point on you may run into God of War Ragnarok spoilers. So if you don't want to know details of the new Santa Monica adventure, stop your reading here.
Available from the blacksmith.
Available for purchase from the blacksmith.
Shield Shards of Stars
You can buy it from the blacksmith.
Shield of the Guardian
This shield is obtained at the beginning of the eighth story mission. It will be given to you automatically at the beginning by Sindri and Brok.
To get this shield there are two different ways. The first is to find the legendary chest right after the boss fight with Garm, in Helheim. But in case you forget to get it, it will automatically be added to the blacksmith shop. This because you will not be able to go back to that point in God of War Ragnarok after the main storyline. So Santa Monica thought of making it available anyway.
And here's how to get all God of War Ragnarok shields.