The wealth and materials required to trade for the armor and weapons from the locals can be obtained in a relatively short amount of time. The main thing you need to do is explore the camps mentioned by Olav, defeat the warriors within them, and loot the chests. Each chest will contain multiple Carbon Ingots, and in one camp (Hvallgrof Outpost) you will find additional carbon ingots when you kill the Wolf-Stormr there. For a full list of wealth and material locations, see below.
As you explore the camps mentioned below, you will encounter various minor treasure chests which provide a large quantity of iron ore and leather. This should provide you with enough of both to obtain all the armor and weapons available from the traders. However, if you need a few more materials after you’ve explored the camps, you can seek out iron ore veins in the wilderness and hunt animals for the leather.
Vinland Wealth Locations - Carbon Ingots
You will find a wealth chest containing a carbon ingot in the heart of this camp. You should be able to take out most of the guards here with assassinations, especially if you have the Advanced Assassination skill, allowing you to take out elite units in one hit if you time it right. Be sure to read the note on the table for some information indicating the location of Gorm.
In this camp you’ll find one wealth chest and two minor treasure chests. The wealth chest is located near the northeastern entrance, but you will need to obtain two keys before you can open it. The first key can be found in a red tent over the bridge to the south, and the second key can be found in a grey tent to the northwest. Once you have both keys, open the chest to find the carbon ingots within.
Here you will find two sources of carbon ingots. One from the Wolf-Stormr, who you will identify immediately by his flaming sword and wolf companions, and one from the wealth chest within the tent in the north of the camp.
The fight with the Wolf-Stormr can be pretty tough without enough armor, especially since he’s accompanied by two Skull-Crushers and Woe-Bringers. If you really don’t want to be bothered with the fight, you can approach the Wolf-Stormr from stealth and assassinate them in one hit if you have Advanced Assassination. Otherwise, enjoy the challenge.
This is the same camp where you’ll find Gorm Kjotvesson, but you don’t have to confront him before you loot the wealth if you don’t want to. The wealth chest can be found in a red tent at the centre of the camp. You’ll need two keys to open it, which are being carried by random enemies within the camp. You should find the enemies at the eastern and western end of the camps. Kill and loot them for the keys, then use both to open the chest. If you have trouble locating the guards with the keys, use Odin’s Sight and then use your raven to scout for them.
Vinland Treasure Chest Locations - Iron Ore & Leather
You will find a minor treasure chest atop a wooden outlook tower in the northwest of the small settlement.
You will find the treasure chest here within the cave under the waterfall where Olav has made his hiding place.
Here you will find two treasure chests within the abandoned camp. You’ll need to kill three bears before you can access them unhindered.