Onyx Hold is one of the better dungeons to farm in Diablo 4. It has no boss but you will encounter a lot of enemies in a rather linear map.
Draw your swords because it is going to be a fight for the last one standing. Onyx Hold dungeon in Diablo 4 is infested with enemies sending shivers down your spine. You are going to be encountering zombies and ghost slaying which is only a feat performed by the worthy.
The objective is simple so the time it takes to complete the dungeon is cut significantly, making it an excellent choice for farming XP.
The objective might be simple but the area it is spanned over is rather large and can drive up the completion time which is something you need to watch out for.Onyx Hold location in Diablo 4
Onyx Hold is located right at the heart of the Onyx Watchtower subregion of Dry Steppes in Diablo 4, meaning that you must first complete the Onyx Watchtower stronghold to unlock its dungeon entrance.
Now there is a waypoint right outside the Onyx Hold dungeon. However, you are likely going to be unlocking this waypoint when you decide to do Onyx Hold in D4.