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. All the crystals are obtained in a different way. The progress can be tracked in the Heart Of The Mountain menu. The Wishing Compass may point to one of the locations.

Jade
The Jade Crystal is obtained in by finding 4 special items with a Metal Detector in the Mines of Divan. After submitting the 4 items to their respective Keepers, the crystal can be picked up.

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 King Yolkar after giving him 3 Goblin Eggs 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 completing the parkour in the Jungle Temple.

Sapphire
The Sapphire Crystal is obtained by giving the 6 different Automaton Parts to Professor Robot 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 (Yellow) Crystal is obtained after defeating Bal, located in Khazad-dûm in the Magma Fields.

After defeating the boss the crystal will spawn near the boss. When the boss is defeated, it wil shrink until it's gone.