Shadow of the Ancients/Story

Journey to Tsurumi

The Traveler hears about a commission from Katheryne in Inazuma that involves investigating an area on Tsurumi Island. However, the last adventurer to take up this commission abandoned it without giving details as to why, and nobody has been willing to take it on since. After accepting the commission, the Traveler discovers a Ruin Grader at the site and defeats it, only for the Ruin Grader to regenerate itself and continue attacking.

The Traveler retreats to Inazuma City and informs Katheryne of this anomaly. She directs them to the commissioner — Hosseini, a scholar the Traveler had previously aided during the event Energy Amplifier. Suspecting this Ruin Grader is drawing from the ley lines for power, unlike ordinary ones which rely exclusively on their Chaos Cores, Hosseini suggests they use the Pursina's Spikes he had shipped from Sumeru to disrupt the flow of the ley lines. However, because the Spikes were damaged in transit, Hosseini gives the Traveler Ayesha's Chaos Prospector, which searches ancient ruins for the relics needed to repair the Spikes.

Survey Sites

Traces of ancient civilizations can be found throughout the continent, but only a few can comprehend them and understand just how mighty these civilizations that lie behind the ruins really were.

—World Map description for Survey Sites

The following ruins contain relics that can be used to repair Pursina's Spikes:

• Stormterror's Lair (the capital city of Decarabian's Mondstadt)
• Yaoguang Shoal
• Qingxu Pool
• Tatarasuna

Autonomous Mechanical Energy Source: Preface

Sampling Points

The energy surging through the ley lines has attracted all manner of foes...

—World Map description for Sampling Points

The test runs for the final calibration are conducted in the same places where the relics were found:

• Stormterror's Lair
• Yaoguang Shoal
• Qingxu Pool
• Tatarasuna

After completing the calibrations two Special Sampling Points will appear:

• Dragonspine
• Guyun Stone Forest

Autonomous Mechanical Energy Source: Live Sample

Anomalous Model Ruin Grader

An odd Ruin Grader that can be found lumbering amidst the thick fog that hangs over Tsurumi Island. It is significantly stronger than your average Ruin Grader.
For reasons unknown, it has appeared on this deserted island, along with the equally enigmatic ancient techniques that power it. Hosseini has a strong academic interest in this Ruin Grader and would like you to defeat it, all the better for his research to continue.

—World Map description, Tsurumi Island

Autonomous Mechanical Energy Source: Conclusion

After placing the Pursina's Spikes in the investigation area and cutting off the Ley Line power flow, the Traveler successfully defeats the Anomalous Model Ruin Grader and informs Hosseini of this good news. Hosseini wishes the investigate further and asks to see the remains of the anomalous model, however the Traveler destroyed it completely; Hosseini remarks on the colossal waste but he takes the blame for not telling the Traveler to leave behind enough for taking samples. Afterwards, Hosseini briefly talks about his struggles in Inazuma so far and considers changing his research topic to the Pursina's Spikes.