In this Diablo 4 guide, we'll share an XP farming method currently the most efficient strategy available. However, please note that it may be patched in the future, so take advantage of it. Dungeon farming, specifically nightmare dungeons, is the key to quickly earning massive amounts of XP. This guide will walk you through the steps to maximize your XP gains using this exploit.

Step 1: Obtain a Nightmare Dungeon and Level Requirement
To begin, you'll need a Nightmare Dungeon that you can easily farm for XP. If you don't already have a Nightmare Dungeon, you can craft one using a Night Message or acquire it through drops. Aim for a Nightmare Dungeon that is at least two or three levels above your current level for optimal XP gains. Keep in mind that the level range of Night Message crafting can vary, so choose one that suits your level. For example, a Tier 10 Night Message can be anything from level 60 to 63.

Step 2: Enter and Exit the Nightmare Dungeon
Once you have your Nightmare Dungeon, enter it and immediately exit. This action is essential to activate the XP farming exploit. After leaving the Nightmare Dungeon, proceed to any other dungeon on the map.

Step 3: Complete the First Objective in Another Dungeon
Enter any dungeon of your choice and complete the first objective. It doesn't matter which dungeon you select for this step. The purpose here is to trigger a change in the objective displayed on your screen.

Step 4: Return to the Nightmare Dungeon
Now that you have completed the objective in the secondary dungeon, head back to the Nightmare Dungeon you want to farm for XP. Upon re-entering the Nightmare Dungeon, you will find that all the enemies have reset, and it remains in nightmare difficulty.

Step 5: Farming and Rules
Inside the Nightmare Dungeon, focus on slaying enemies to earn XP. Using an XP potion during this process is recommended to further increase your gains. However, there are two important rules to follow. Firstly, do not complete the dungeon by defeating the boss if it is required. Secondly, if the dungeon is completed by fulfilling an objective, refrain from finishing the objective.

Step 6: Resetting the Dungeon
Once you have farmed a sufficient amount of XP and Diablo 4 Gold or are unable to progress further, leave the dungeon. Re-entering the Nightmare Dungeon will reset all the enemies, allowing you to continue farming with the same XP gains. Repeat this process as desired.

Conclusion:
Using this exploit to farm nightmare dungeons in Diablo 4 provides the fastest way to earn XP currently available in the game. However, it's important to note that this method may be patched in the future, so make the most of it while you can. Remember to follow the rules of not completing the dungeon or quitting the game to maintain the exploit's effectiveness. With this guide, you'll be able to level up rapidly and develop your character in no time.