Hosseini is a researcher who is currently troubled because of his research. All his samples for the Energy Amplifier research are gone and he is asking you to help him out. Use this guide to begin Act I of the Energy Amplifier Fruition event.
To begin the quest, you have to be at least Adventurer Rank 20. Go to the event page and accept the preliminary quest to start the event. Use the teleport waypoint in Wangshu Inn and go to the Dihua Marsh.
Go to the quest area and you will see a small shack with wooden tables surrounding it. Hosseini is right beside the wooden shack. Talk to him and he will ask you to investigate three places of interest near the Wangshu Inn.
The first place of interest is directly west of the Dihua Marsh in Minlin, Liyue. Use the teleport waypoint near the area and you will see a monster camp.
NOTE: In all places of interest, mutation stones are present and should be destroyed because it can make the enemy stronger, making them dangerous and difficult to defeat.
Destroy the mutation stone inside the enemy tent to decrease the strength of your enemies. Once you are done, claim the rewards.
The second place of interest is on the ruins to the south. Use the southwestern Minlin waypoint to get to the quest area. The mutation stone is inside the small shack to the right.
After defeating all the enemies, use the Minlin waypoint near Cuijue Slope to get to the last place of interest. The mutation stone is inside the southern shack of the camp.
Once you are done, you can get a total of 80 Primogems and multiple talent level-up materials.
If you want to collect more Primogems, be sure to clear the Deceitful Domain!