All items stack infinitely and occupy one slot in the player's inventory or vault. Items can be sold or bought at a Market for coins.
Some items, such as equipment and tools don't go in the player's inventory, instead they are located in a special menu and can't be messed with at all.
Materials are items which only function is to be used to craft other things. Some materials can be found in the wild, some are dropped by monsters or animals, some can be crafted and some can be gained as rewards for completing quests and opening chests.
Food can be consumed to regain energy, while Cooked Food will also recover missing health. In order to cook food, certain skills are required, such as Agriculture and Hunting
Potions are consumable items with a variety of beneficial effects that may last up to a few minutes once drank. Potions can be crafted at a Cauldron and require the perks Novice Potions and Expert Potions.
Scrolls are consumable items with amazing magical powers. They can be crafted at an Inscription Table and require the perks Novice Scrolls and Expert Scrolls to be unlocked.
Tools are pieces of equipment that can be used for fighting, crafting, digging and puzzle solving. Some tools, like Pickaxes, Swords and Bows can be upgraded in order to become more effective.
Accessories provide the player with passive effects such as increased inventory space and faster run speed. All accessories can be upgraded many times throughout your journey. Boots and Gloves are unlocked by the perk Textiles and Amulets are unlocked by the perk Jewelry.
Those are items used in farming, such as seeds.
Artifacts are equipment pieces awarded by opening Locked Chests. They provide the player with a beneficial permanent bonus.
Archeaology items are rare finds either dug up from Digging Spots or by Fishing.
Seals are proof that the player completed a challenge in the game. They appear in the Equipment screen but have no effect in the game.