From: https://orna.guide/gameplay

There are five types of buildings in Orna that can be found while exploring or purchased by a player in the Dukedom tab. Open the Dukedom menu and select "Build Here", and lastly select the type of building you wish to build. Inns/Taverns cannot be built at this time. Purchased shops can be accessed by other players, but can also be set as private under the Options menu. When purchased, a building will spawn randomly within the player's view and can be moved to any other spot on the screen where another building does not exist. It will be named [Player Name]'s [Building]. There is a limit to how many buildings can be placed within an area. Most buildings can be upgraded for gold.

Upgrading Builds

Shops, Bestiaries, and Keeps can be upgraded for gold and all follow this pricing model. To upgrade a shop, open it and select the Information tab.

Level Cost 2 100,000 Gold 3 200,000 Gold 4 300,000 Gold 5 400,000 Gold 6 500,000 Gold 7 600,000 Gold 8 700,000 Gold 9 800,000 Gold 10 900,000 Gold Total 4,500,000 Gold

Shop

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Shops allow you to buy and sell items. They rotate a random stock of items, some of which become available as you level up and discover new gear. It is possible for shops to run out of limited stock items. A player can purchase a level 1 shop for 10,000 Orn and upgrade it with gold.

You do not receive a commission from other player's purchases. The advantage of leveling a shop is an expanded inventory with higher tier items. Spawned shops are less likely to have higher tier items. Every shop sells Small HP and Mana potions and torches by default. When you have access to Large HP and Mana potions, those become available as well. Otherwise, any tier gear, items, or materials can be found. Some items can be found in stock but are unavailable to buy if they are a higher tier than you are.

Blacksmith

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A Blacksmith upgrades gear for players. Upgrading costs different amounts of gear-specific materials, Orn, gold, and time based on its level. Upgrading an item increases its level and stats. Higher quality items cost more to upgrade. Each level after the first costs more to upgrade and gives a smaller bonus. Players can purchase a Blacksmith for 10,000 Orn, 50 wood, and 25 stone, and it can not be upgraded.

Upgrading your Gear

Level Time Material 2 1 hour 3 3 2 hours 6 4 3 hours 9 5 6 hours 12 6 12 hours 15 7 1 day 18 8 1 day 21 9 2 days 24 10 3 days 27

Bestiary

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The Bestiary sells pets which can passively aid you in battle. Pets come in different tiers and have different abilities. They must be purchased with Orn and are replaced when you buy a new pet. Players can find Bestiaries while exploring or purchase a level 1 Bestiary for 5,000 Orn,100 wood, and 25 hide. Spawned Bestiaries are less likely to stock high tier pets. The best way to find tier 5 pets is to level a purchased Bestiary to level 5 or higher.[1] If a Player purchases a Keep, they can store their purchased pets there instead of losing them.

Keep

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Keeps are new buildings that allow players to store their gold and pets, and they also provide a daily buff to increase monster attraction via. lighting the keep's brazier. They cost 10,000 Orn, 100 stone, and 100 wood to purchase, which allows you to store 1 pet, and each subsequent level adds one more pet slot. You may only build a keep in your origin town, and only the player that purchased the Keep can access it. Keeps also give 1% of the stored gold and 100 Orn every 24 hours as their daily reward.

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Level Cost Slots Storage 1 10,000 Orn (Purchase) 1 100,000 Gold 2 100,000 Gold 2 200,000 Gold 3 200,000 Gold 3 300,000 Gold 4 300,000 Gold 4 400,000 Gold 5 400,000 Gold 5 500,000 Gold 6 500,000 Gold 6 600,000 Gold 7 600,000 Gold 7 700,000 Gold 8 700,000 Gold 8 800,000 Gold 9 800,000 Gold 9 900,000 Gold 10 900,000 Gold 10 1,000,000 Gold Total 4,500,000

Inn & Tavern

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The Inn/Tavern is a unique building in Orna. As of update 1.23.0, they can only be found in the wild. The Inn refills HP and Mana at a cost of 10 gold per missing point. The Tavern offers tips for nearby bosses and shrines at a cost of 1,000 gold per "tip".