In Game Description
Weapon forging material. Can be used to forge 4-star catalysts. Philosophers believe marble has the potential to be sculpted into a beautiful statue. Likewise, these billets have the potential to become something greater.
Previously, this item known as Northlander Catalyst Prototype. It’s used to forge 4 craftable catalyst in Genshin Impact:
Where to get Northlander Catalyst Billet?
There’s some options available about how to get Northlander Catalyst Billet, as listed below:
Reward from Adventurer Handbook Chapter 4
You can get Northlander Catalyst Billet after completing all missions in the Adventurer Handbook Chapter 4. To be more specific you can get this reward around Adventure Rank 18-20, after unlocking Stormterror Lair with main quest and activating Statue of the Seven in the center of Stormterror Lair.
Xingxi from Mingxing Jewelry in Liyue Harbor
Xingxi from Mingxing Jewelry in Liyue selling this Billet for 225 Geo Sigil. You can get Geo Sigil from your exploration across Liyue.
Northlander Billet Trove
Northlander Billet Trove is an item that contains 5 choice of weapon prototypes. This item usually can be obtained from major in game event.
Chance from Weekly Bosses
Albeit it’s rng, getting catalyst billet is from weekly bosses is your best chance. Starting from Mondstadt to latest content, we have 6 weekly bosses scattered across Teyvat. More bosses will coming in the future, means more chance to get this billet.
|Stormterror Dvalin in Mondstadt||Wolf Boss in Mondstadt|
|Childe Boss in Liyue||Azhdaha in Liyue|
|Signora in Inazuma||Raiden Shogun Boss in Inazuma|
Converting from It’s Midlander counterpart
Sumeru update bring new type of billet and of course we have new item called Midlander Catalyst Billet. Traveler actually can convert midlander to northlander and vice versa with 2x Dream Solvent, though for now it’s not recommended since midlander billet is quite rare and hard to obtain, for now.