We sail on the sea, we find the moon island. We find 3 holes forming an equilateral triangle. We find 3 lunar parts, from which we assemble the structure. There are 2 more remaining.

Then we go down to the caves and ruins. Here we craft two staffs: the staff of summoning stars and the staff of destruction.

We find a moon platform in the forest that needs to be repaired from a moonstone.
On a full moon, we lay down the staff of the summoner of the stars. Defending ourselves from waves of enemies (for example, by surrounding ourselves with statues)
We get the staff of the moon summoner. We disassemble it with the staff of destruction and get an iridescent gem.

We go underground. We find the archive. To turn on the electricity, you need to put a third iridescent gemstone.
We collect liquid knowledge and bring it to the central room to discover new recipes.
Namely, we open the Astral Detector and use it to find two parts of the heavenly sanctuary. We take them to the moon island to the triangle and install

We find the grandmother, complete her tasks to get the pearls as a reward.

The crab King can be found using the astral detector (because the last part lies under it).
We insert pearls and 8 other gems into the crab, after which the boss fight begins.
We defeat him, and we get the heavenly offering with the help of an effervescent winch (the recipe is obtained from the grandmother)
We take the last part to the lunar island and install it in a triangle. In total, a mysterious energy should appear, and a moonstorm appears on the map.

We go to the moonstorm and find a grainy broadcast that gives recipes. Next, we collect all kinds of resources in it and build a Lunar Siphonator.

When the third stage is built, the Moon Champion bossfight will begin immediately.
After the victory, a grainy broadcast will appear nearby, which will offer to activate the rift for the dropped crown fragment.

https://www.youtube.com/watch?v=-IZcmIs6fi8

To do this, you need to find a structure with three marble sculptures.
And you need to bring suspicious marbles scattered across the map to them. For normal carrying, you need either a pumped-up Wolfgang, or tame the beefalo a little and make a saddle.
After that, the subordinate sculptures can be broken:
On a full moon, ordinary chess sets will appear from them + a drawing.
On the new moon, shadow chess sets will appear from them + a blueprint

To summon them, you need to build 3 stone chess sculptures and destroy them with a hammer at the new moon.
Be careful during the battle! If you move too far away from each other, then killing one of the chess players will not raise the level of the others - you will not get the desired reward!
As a result, he gets a shadow atrium, one of the two key subjects.

We go down to the caves. We extract 8 bones from stalagmites
We find ruins. We go through the maze and find the Guardian
After killing him, we get the Ancient Key, the second necessary item.

We kill the big tentacles - one of them leads to the atrium. For convenience, such a tentacle can be marked with a sign.
For normal movement through the atrium through the obelisks, you need either an amulet of nightmares or a lazy researcher.

To summon the Ancient Fuel Product, you need to build a skeleton of 8 fossils (do not forget to take a hammer, because there is a chance to assemble incorrectly), insert a key into the portal, and an atrium into the skeleton. The boss is called!

After the victory, a shadow hand will appear nearby, which will repair the portal and activate shadow rifts for 5 horror stones.
((the stones of terror can be obtained as a result of defeating the Werewolf, he only needs a pickaxe from a special one)

https://www.youtube.com/watch?v=YXnCpz0j8KM