Items

Restoratives
Restoratives come in 3 basic forms, but with varying tiers.

Purple waters, Rejuve Juices, and Elixirs of varying tiers restore both HP and MP.

Green waters, Tincures, and Ethers of varying tiers restore MP.

Pink waters, Tonics, and Potions of varying tiers restore HP.

Stamina potions restore stamina.

Consuming a drink will cause your thirst to degrade, making the next drink restore slightly less. Your thirst regenerates over time, and it restores more quickly when not in battle. Carbonated drinks are more effective than standard drinks.

Antidotes cure poison, while eye drops cure blindness. Neither of these reduce your thirst.

Food
Food items give a heal over time effect, like the restoratives above, their effectiveness is determined by hunger.

Tomatoes and Watermelons provide MP regeneration.

Lettuce and Cooked Eggs provide HP regeneration. You can eat raw eggs, but doing so will risk becoming sick.

Resources
Besides gold, domains are built using 2 resources, wood and stone. Re-logging will cause you to drop all resources, and resources are both heavy and take 1 slot each in your inventory.

Wood can be gathered by cutting most trees, using any Axe. Trees drop 1-3 wood each. Trees regrow over time.

Stone can be gathered by mining any mountain tile, using any hammer. Mountain tiles do not disappear, but successive mining of a single mountain tile will take longer per stone. Stone is much heavier than the already very heavy Wood.

Most domains have abundant sources of both Wood and Stone nearby.

Misc
Flowers and Bouquets can be thrown at players and NPCs to declare peace if you've been hostile towards them.

Keys can be used to lock and access player built houses in domains. Keys cannot be stolen by Thief/Ninja classes, but the houses themselves can be picklocked unless a White Mage enchants the lock.

Books and parchment can be requested from a player built domain library. Parchment can be placed inside books to fill them.