On this page of the Genshin Impact guide, you will find out what are and when you can unlock Spiral Abyss, how to get into Spiral Abyss and what special rules are in play there.
Spiral Abyss - what is it?
Spiral Abyss is a special dungeon that the player unlocks upon gaining 20 Adventure Rank (AR). This Dungeon changes every month - mostly prizes and opponents change. Spiral Abyss is divided into 8 rooms, and there are 3 chambers in each of them, so to complete each Spiral Abyss you need to complete as many as 24 chambers. You get rewards for completing each of them. Depending on the time in which you complete the room, you will receive 0-3 stars. After receiving 3 stars, you will be given the opportunity to receive a special award, which includes Primogems. To advance to the next room, you must earn at least six out of nine possible stars. After clearing room 8, you unlock Abyssal Moon Spire.
How do I get in?
Although you get access to Spiral Abyss once you get 20 AR, getting into Spiral Abyss is not as easy as it seems. The Teleport that will take you to Spiral Abyss is located on a remote island, and you can reach it through a hole in the sky.
To be able to fly high enough to get into the hole, you have to walk three souls to the surrounding altars. The moment the souls are discharged, there will be an air current in the middle that will allow you to fly up and get into the hole.
Just go in there and you'll be on the other side. There is a portal that will lead you to Spiral Abyss. Next time you won't have to go through a hole in the sky, as you will unlock a quick trip to that place, just open the map and choose where the Spiral Abyss is located.
Spiral Abyss offers increasingly difficult challenges and more interesting rewards, but it is important to remember that special rules apply here. In each of the rooms you will get some bonus e.g. to Elemental Damage. In addition, every time you start a new Chamber, you have to choose from one of the three available buffs to help you through the dungeon. It's important to remember that when you walk through a room, you can no longer change Party composition. Also, you can't resurrect allies or cure them with food. If any of your characters die, they cannot be resurrected, thus in the next Chamber, you will be forced to play without the character in question. Decide before choosing the team which Elemental will be key.