The Slumbering Court Domain was introduced to Genshin Impactin update 2.3. It is located on Seirai Island, to the west of Fort Hiraumi. To gain access to the domain, players simply need to visit it on the map. There are no associated quests or puzzles to solve to open the doors, unlike some other domains.
By completing the Slumber Court Domain, players can collect the Ocean-Hued Clam artifact set and the Opulent Dreams artifact set.
Like all Domains, the Slumbering Court is split into different difficulty levels, depending on your party level. You can see a list of the enemies you will be facing below. The recommended element for this domain is Electro.
Remember, you will need 20 Original Resin to claim your rewards after completing the Domain, so make sure you have enough before you start to farm it. You can also use a Condensed Resin to take advantage of double rewards.
