Nostoi Region and the Sea of Bygone Areas in Genshin Impact

Patch 4.6 released 2 new explorable regions with a whole host of Hydroculus, chests and puzzles available.

This is split into 2 regions which you can 100%.

• Nostoi - Contains the town of Petrichor and the Faded Castle.
• Sea of Bygone Eras - A separate underwater map unlocked during this Regions World Quest.

It is highly recommended that you complete the World Quest before heading off to explore, however you will likely collect some Oculus and chests while completing this quest.

The Ancient Autoharmonic Music Box is an ancient music box found inside of the Faded Castle. This grants you the power of the Symphony for exploration as well as providing Primogems as you collect each of the six scores available.

Nostoi is the overworld half of this region featuring Petrichor and the Faded castle. It is a very small area with not many chests or collectables available.

Listed below are our pages for special puzzles and collectables available inside of the Nostoi Region.

The Sea of Bygone Eras is accessed via the World Quest unlocked at the beginning of Petrichor. With the Sea of Bygone Eras being a separate map much like Enkanomiya and The Chasm but this time is almost entirely underwater.

The release of patch 4.6 also comes with a Hydro Sigil shop so that you can spend any excess Sigils not used in the Fountain of Lucine.

A very welcome change with Fontaine's exchange is that you are able to buy an unlimited amount of Weapon Ascension Materials with any remaining sigils. Historically, there has only been Mora available but this change can be a nice boost in resources for players who still have a range of Fontainian weapons to upgrade.