Strong Acid is one of those materials in Subnautica 2 that blocks your entire progression until you sort it out. You need it for power cells, power cells go into the Tadpole submarine, and the Tadpole is how you actually start exploring deeper ocean zones. The bottleneck is Necrolei Cysts, a plant-based resource that spawns in exactly one small area near the starting zone and nowhere else nearby. Miss it, and you'll be swimming in circles wondering why you can't advance.
Where to find Necrolei Cysts in Subnautica 2
Before heading out, open your character menu and enable all landmark signals. This makes nearby points of interest visible on your HUD and is the fastest way to orient yourself around the key landmarks mentioned below.
Necrolei Cysts grow on plants called Stilt Orbs, which sit on the seafloor at roughly 25 meters depth. The biome containing them sits approximately 300 meters northwest of the Lifepod. To navigate there accurately, float directly beneath the Lifepod, align your compass HUD to the NW marker, and swim in a straight line for 300 meters.
The biome itself is hard to mistake once you're in it. You'll see large flower-shaped organisms with dark green ridged bodies and pink frills along the edges of their petals. These giant plants are the landmark. Once you spot them, look lower on the seafloor for the Stilt Orbs.
Stilt Orbs on the seafloor
What do Stilt Orbs look like?
Stilt Orbs are green, onion-shaped bulbs anchored to the seafloor by multiple pink feelers or root-like tendrils. A small flower grows from the top of each bulb. That flower is the Necrolei Cyst. The same cluster sits about 90 meters north of the first Angel Comb signal and 300 meters north of Wander's Blackbox, which gives you two additional reference points if you're already further into the map.
Tavel toward the Old Habitat point of interest directly north of the Lifepod. At around 300 meters north, you'll find the same green and pink coral biome with the Stilt Orbs scattered throughout.
How do you harvest Necrolei Cysts?
Equip your Survival Multitool and strike the top of the Stilt Orb bulb to break it open. Each Stilt Orb drops one Necrolei Cyst. The Stilt Orb itself cannot be picked up or interacted with beyond harvesting the cyst from it. You'll need a Survival Multitool crafted beforehand, which requires 3x Titanium at the Fabricator in your Lifepod.
How to craft Strong Acid in Subnautica 2
You cannot make Strong Acid at the standard Fabricator. The recipe requires a Processor, which is a separate crafting station you need to build at your base first.
How to unlock the Processor blueprint
You can find broken Processors inside the Old Habitat POI. Enter through a hole underneath the base of the structure. Scan the broken Processors inside to unlock the blueprint. Once you have it, build the Processor at your base and make sure your power supply can run it.
The Processor itself requires:
- Titanium x2
- Mild Acid x1
- Copper Wire x1
Mild Acid comes from combining Copper and Acidic Raion Pouches at the Fabricator. Copper Wire is also Fabricator-crafted from Copper ore, which spawns primarily inside caves. Check out our guide on how to craft a battery in Subnautica 2 for more detail on sourcing Copper fast.
Power Cell recipe breakdown
Strong Acid recipes
Once the Processor is running, you have two ways to make Strong Acid:
The Necrolei Cyst route is the one you'll use early on. The Sulfur and Gold alternate recipe requires access to the lava biome, located roughly 230 meters southeast of the Lifepod, which is locked behind the Heat Tolerance Adaptation. That's a mid-game unlock, not a starting option. For more on getting there, see our Subnautica 2 sulfur location guide.
The standard Fabricator only produces Mild Acid. If you're trying to make Strong Acid there and getting nowhere, that's why. You need the Processor specifically.
What is Strong Acid used for in Subnautica 2?
Strong Acid feeds into several key crafting chains. Here's every item that requires it:
The Power Cell is the immediate priority. You need it to build the Tadpole submarine, which is the vehicle that lets you dive deeper and collect resources at a pace that actually feels worthwhile. Power Cells can also be recharged at a Power Cell Terminal built at your base, which means you don't need to keep farming Necrolei Cysts indefinitely once you have a few cells running.
Fiber Mesh is the other early unlock worth noting. It feeds into Improved Fins and the Rebreather, both of which matter for extended dives. For the Salt component of Power Cells, check our guide on how to find and farm salt fast.
For more material guides and crafting walkthroughs, browse the full Subnautica 2 guide collection to keep your progression moving.