These formulas basically require daily alchemy to get convertible items.

It will take a long time to collect all these.

6. 1 alchemy formula is relatively simple, and the level 3 fortress hall will refresh one NPC every day.

This may be the daily task of NPC or businessman NPC.

Among them, the merchant NPC refreshes in a fixed order: ore, Delano dust, animal hair, leather and herbs.

Every five days, it's a merchant's turn, and the herbal medicine merchant will sell the alchemy formula.

Of course, if there is a daily task for NPC to jump the queue, you can only wait for the next time, but you can also go to your friend's fortress to have a look. If they refresh the herbalist, you can also buy an alchemy formula.

Today, the national clothes should be refreshed in order, and it should be Delano Dust Merchant.