Crystal Nucleus

The  is a location in the Crystal Hollows, mainly used to deposit collected crystals from expeditions. Players can travel to main areas of the map using each of four corners, including the Magma Fields directly below the platform. After all five crystals are delivered to their respective statues, a treasure stash will appear opposite of the Topaz Crystal Statue. Treasure stashes are completely random, meaning each item listed isn't guaranteed to drop. Crystals are reclaimable as well to unlock more treasure stashes.

Location
The Crystal Nucleus always spawns at. Within the Nucleus, blocks cannot be broken.

The Nucleus has 8 entrances. 4 of them lead to each of the 4 Crystal Hollows biomes: for the Jungle,  for the Mithril Deposits,  for the Goblin Holdout, and  for the Precursor Remnants. The other 4, located at, , , and lead to the Magma Fields.

Crystals
To get the rewards the player needs to find and place five Crystals: Jade, Amber, Amethyst, Sapphire, and Topaz. The two other Crystals, Ruby and Jasper have no known use. All the crystals are obtained in a different way. The progress can be tracked in the Heart of The Mountain menu. The can point to the locations of the Crystals.

Jade
The Jade Crystal is obtained in by finding 4 Scavenged items with a in the Mines of Divan. After giving the 4 items to their respective Keepers, the Crystal can be picked obtained.

Amber
The Amber Crystal is obtained from the Goblin Queen's Den in the Goblin Holdout.

In order to obtain it, the player must get the King's Scent effect, which is obtained from after giving him 3 s of the same color.

After obtaining the King's Scent effect, the Queen's Den can be entered to obtain the Crystal. This effect lasts for 20 minutes, but it can be used multiple times to get the crystal. Entering water will remove the effect.

Amethyst
The Amethyst Crystal is obtained from entering the Jungle Temple by giving a a  and completing the parkour.

Sapphire
The Sapphire Crystal is obtained by giving the 6 different to  in the Lost Precursor City. After giving the parts to him, he will repair the Automaton Prime, and a door will open which reveals the crystal.

Topaz
The Topaz Crystal is obtained after defeating Bal, located in Khazad-dûm in the Magma Fields.

After defeating the boss, the Crystal will spawn nearby.

Jasper
Can be obtained by killing in the Fairy Grotto, or by looting chests in the Fairy Grotto.