Sandustry Critters
Five critters live underground and one produces Water forever. What each produces, what the Corraller costs, and how that water compares to a Cryoblaster.
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Three of the five are worth building around, and until this week only one of those was documented. The Lumling releases Water on a repeating cycle. The Voltblub produces energy, but only into a filled Copper Mold. The Voidgrazer turns spent Void Husk back into Void Juice. Catching anything requires the Corraller, at tier 4 and 1,250 Gold.
Critters are easy to file under scenery. Four of the five produce something you can actually collect.
The five, and what they produce
| Critter | Produces | What it does |
|---|---|---|
| Lumling | Water | Drifts through underground caverns and releases water in regular bursts. Water on a repeating cycle, and more of them in one place means more water. Its own page calls it the only infinite water source in the world — the Cryoblaster's snow is the other route, and costs less to reach. |
| Redweaver | Redsand | A slow-moving creature that leaves a trail of Redsand behind it. A renewable Redsand source, which matters because Redsand is half of the Voidbloom recipe. The official tip is the catch: they are "not great navigators" and will often box themselves in with their own Redsand, ending up trapped and producing nothing. Left alone, one stops being a supply. |
| Voltblub | Energy | An electric creature that regularly produces a small amount of energy. Its energy only lands somewhere if the critter is sitting on a filled Copper Mold — a Power Brick. The official page states that as of v0.5.5 sitting one on an Energy Connector does not capture anything. Note the page contradicts itself: the infobox Produces field reads Water, while the description, the prose and the tips all say energy. Recorded as Energy because three statements agree against one field, and because a creature described as electric producing water has no other support anywhere. |
| Voidgrazer | Void Juice | A void-touched creature that liquefies Void Husk back into Void Juice. The only critter that closes a loop. Charging the Void Gun or the Locator with Void Juice leaves Void Husk behind; a Voidgrazer slowly eats that Husk and gives the Juice back, so the official page frames it as the reason you do not have to keep producing more. |
| Shinelet | Decorative Light | A light-bug that floats through dark areas. Decorative only. The official page records no production beyond the light it gives off, so it will not save you a Flare Gun on the way down. |
The Lumling is the one that matters
It drifts through underground caverns and releases water in regular bursts. Put several in the same place and you have a water supply that never runs down and costs nothing to run.
That matters because water is an input to most of the early economy — Sand becomes Wet Sand becomes Gold, Seeds have to be wet before a Planter Box will take them — and hauling it up from wherever you found it is one of the first logistics problems the game hands you.
Lumling water versus Cryoblaster water
The official pages disagree about which renewable water source is the renewable water source. The Lumling page calls itself the only infinite water in the world; the Snow page says Snow is the only renewable source besides duplication; the Cryoblaster page says it unlocks an infinite, if slow, supply of its own.
They are two different routes and both work, but they are not equivalent, and the difference is not the one you would guess from the unlock prices.
The Cryoblaster does not make water. It makes Snow, endlessly, and Snow has to be converted: heat it — a Flamethrower will do it — and route the resulting Steam somewhere it can rise, hit a ceiling and rain back down. Steam with nowhere to go condenses on its own after thirty seconds and rains anyway, so the loop closes either way, but it is a loop you have to build and give vertical space to.
The Lumling makes water. Release one where you want the water and it produces some on a cycle, with nothing to convert and nothing to arrange.
| What it actually produces | Unlocks it needs | |
|---|---|---|
| Lumling | Water, directly, on a repeating cycle | Corraller — tier 4, 1,250 Gold |
| Cryoblaster | Snow, which you then turn into Steam and let rain | Cryoblaster tier 2, 1,000 Gold, plus a heat source such as the Flamethrower at 400 Gold |
So the Cryoblaster wins on when, not on how much or how simple. It is two tiers earlier, which in practice means it is the answer available to you when the water problem first bites. By the time you have tier 4 and a Corraller, a Lumling is the cleaner solution to the same problem — no conversion, no steam plumbing, and roughly the same Gold once you count the heat source the snow route needs.
The Cryoblaster is worth its 1,000 Gold regardless: the same tool is what starts the lava cycle, so it pays for itself twice over.
Capturing them
The Corraller is the tool, and it is a tier 4 unlock at 1,250 Gold. It projects a field that pulls creatures in, and it both captures and releases — so a Lumling can be moved to where you want the water rather than left where you found it.
Capturing a critter for the first time also registers it in the conservatory and pays out a conservatory ticket. What the conservatory is and what tickets are good for is not documented anywhere official — both pages are empty — so this page does not guess.
The three that were blank until this week
Redweaver, Voltblub and Voidgrazer were names on a list and nothing else when this page was first written. All three were documented between 19 and 22 August 2026, and two of them turn out to matter more than the two that were written up first.
Voltblub produces energy — but only if it is sitting on the right thing. The official tip is specific: their energy “can be captured if they are sat on filled Copper Molds”, which is to say on a Power Brick. The same page adds that as of v0.5.5 sitting one on an Energy Connector captures nothing. So a Voltblub is not a generator you place; it is a generator you park.
One caution about that page. Its infobox lists Water as the produce while its description, its prose and its tips all say energy. We record energy — three statements against one field, and an electric creature producing water has no support anywhere else.
Redweaver lays down Redsand, which is half of the Voidbloom recipe — a renewable supply for a material you otherwise dig. The catch is in the official tips, and it is a good one: they are “not great navigators” and will often box themselves in with their own Redsand, ending up trapped and producing nothing. Unattended, one stops being a supply.
Voidgrazer eats Void Husk and gives back Void Juice, and it is the only critter that closes a loop — see the void line for what that saves you.
Related
- How to Move Lava in Sandustry — the Cryoblaster’s other job
- Sandustry Research Planner — what the Corraller costs once you count prerequisites
- Sandustry Production Chains — where all that water ends up going
- How to Move Water in Sandustry — all four sources, and how to pipe it
