Genshin Impact’s Spectral Secrets expedition event is currently underway. Each day, players can choose between S, A, and B rank expeditions, select dispatch members, and send a party on selected expeditions to get a variety of rewards.

Related | Genshin Impact Spectral Secrets Event Complete Guide

The S-Rank expeditions in Genshin Impact’s Spectral Secrets event are special and offer the most rewards. To dispatch a party on the S-Rank expedition, players first have to conduct a Preliminary Investigation where they have to light three Electric Pillars and then defeat a given number of Specters.

On Day 7 of the Spectral Secrets event, the Preliminary Investigation area is near the Formation Estate domain on Yashiori Island. In this guide, we will share the location of all three Electric Lamps that you have to charge up to progress the investigation.

Spectral Secrets Preliminary Investigation Day 7 “Keep Our Island Secure”

Image Credit: Hritwik, miHoYo

To complete Day 7 “Keep Our Island Secure” Spectral Secrets Preliminary Investigation, players have to:

  • Find and charge three Electric Lamps using Electrograna.
  • Defeat twelve Specters.

The Electric Lamp is made of stone stacked upon one another. You can find them using Elemental Sight.

If you haven’t completed Spectral Secrets event previous Preliminary Investigations, then follow the below guides:

Day 7 Formation Estate Electric Lamps Location

As we mentioned earlier, the seventh-day Preliminary Investigation will take you near the Formation Estate domain on Yashiori Island. Once you arrive there, you have to find and charge three Electric Lamps.

First Electric Lamp Location

Image Credit: Hritwik, miHoYo

Second Electric Lamp Location

Image Credit: Hritwik, miHoYo

Third Electric Lamp Location

Image Credit: Hritwik, miHoYo

How to Activate the Electric Lamps

Use the nearby Thunder Sakura Bough to summon an Electrograna. Once you have it, go near the Electric Lamps and they will light up on their own.

Image Credit: Hritwik, miHoYo

Once you light up all three Electric Lamps, you have to defeat twelve Specters. Doing so will complete the Spectral Secrets Day 7 Preliminary Investigation “Keep Our Island Secure.”

Genshin Impact is a free-to-play gacha-based role-playing game currently available on PC, PS4, Android, and iOS.

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