Weapons can be upgraded at the Blacksmith shop or within your Quarters. The upgrade will require SOM tokens. Sometimes special items can be engraved into your weapons to provide huge permanent bonuses. To craft such an upgrade you might also need to have a Quest item which is usually an Artifact – special mutation NFT.
You may also loot or purchase an Enchanted Scroll NFT for upgrading the item instantly. It can be used directly from your inventory at any moment of the game.