Graveyard Keeper 2 Blue Crystal

Every Zombie Collar at the Jewelry Table takes 1 Blue Crystal, and every new zombie needs a collar.

Bronze collar: 1 Bronze Ingot, 1 Blue Crystal, 3 Faith. Golden: 1 Golden Ingot, 1 Blue Crystal, 5 Faith. Steel: 1 Steel Ingot, 1 Blue Crystal, 10 Faith.

So your crystal supply caps how fast you can grow your workforce.

Gunter, the astrologer, buys Blue Crystals at trader level 1 but does not sell them yet — that listing confuses many players.

From trader level 2 he sells them at a base price of 75 bronze, with up to 10 in stock. He pays about 56 bronze when you sell one back.

After Heart of the Swamp is complete, a pile of 4 Blue Crystals appears by the Goddess of Nature statue at the start of every Envy.

Envy is the fourth day of the six-day week — the same day the Resurrection device works, which makes it a natural collect-then-raise routine.

Clear the pile each week; community notes say story scenes at the statue can hold up a respawn.

Blue Crystal carries 1 green and 2 blue runes and appears in alchemy formulas such as Umami, Alkali, Berserker Potion III, Reanimation Liquid and the Philosopher Stone.

Studying one costs 15 Science and pays +10 green and +20 blue tech points.

It stacks to 20 and fits the Alchemist's bag, Universal bag and Big universal bag.

The crystal is only a collar ingredient. The body still needs its organs, Reanimation Liquid and a collar on a Resurrection Table.

Our zombies guide covers the full resurrection routine.