Abyss Dungeons are integral in the path to gear progression within Lost Ark. Clearing Abyss Dungeons will give you the materials you need to craft Legendary Equipment for your tier. If you have any experience from the Russian servers, Abyss Dungeons are known as Void Dungeons on the Russian servers.
To unlock Abyss Dungeons in Lost Ark, you will need to get to Northern Vern. After you hit level 50 and you have arrive in Vern, you should be able to continue your Blue World Quest line. Continue the Blue World Quests within the Northern Vern region until you get to and complete “Waiting and Leaving“. When you complete this quest, a big notice will appear briefly on your screen telling you Abyss Dungeons have been unlocked.
You should be aware that you will need a group of 4 to join Abyss Dungeons. It is not the same as Chaos Dungeons, where the game will allow you to solo the dungeon.