Overview
In the depths of Subnautica 2, the necrolei cyst is a rare but essential resource for crafting strong acid, a critical component for constructing the tadpole vehicle. Unlike common early-game materials, necrolei cysts are easily overlooked due to their subtle appearance and specific spawning conditions. This guide will walk you through every step—from preparation to harvesting to crafting—so you can efficiently locate and collect these cysts without wasting time or risking your safety.
Prerequisites
Required Equipment
- Seaglide or Prawn Suit for efficient underwater traversal. A Seaglide is sufficient for early exploration; later, a Prawn Suit with a drill arm can speed up collection.
- Repair Tool to fix any damage from hostile creatures in cyst-rich biomes.
- Knife or Propulsion Cannon to defend against aggressive fauna.
- High-capacity oxygen tank (preferably 180+ seconds) since cysts often appear in deeper, dimly lit areas.
- Beacon to mark fruitful locations for future visits.
Knowledge Requirements
- Familiarity with basic crafting (fabricator) and resource scanning.
- Understanding of Subnautica 2’s depth zones: safe shallows, grassy plateaus, and the twisty bridges region where cysts first appear.
- Ability to identify a necrolei cyst: small, translucent, purple-ish spheres attached to cave walls or vegetation, often glowing faintly.
Step-by-Step Guide
Understanding Necrolei Cysts
Necrolei cysts are a biological resource produced by the necrolei plant, which resembles a cluster of pale, parasitic bulbs. Unlike the more common creepvine samples or quartz, these cysts are not found in standard coral formations. They spawn exclusively in specific biomes and are most abundant near thermal vents or areas with low light. Each deposit yields 2–4 cysts, and they respawn every 20–30 minutes of real time (approx. 2–3 in-game days). To craft strong acid, you’ll need exactly 3 necrolei cysts plus 1 battery acid (crafted from common resources).
Locating the Cysts
- Start in the Twisty Bridges biome (coordinates roughly -300, -80, -400 relative to your lifepod). This biome features convoluted rock arches and a high density of necrolei plants. Swim through narrow crevices near the seafloor.
- Look for thermal vents. Cysts cluster near geothermal activity. Scan for bubbling water or pale green glow—these indicate a nearby vent, and cysts will populate the surrounding walls.
- Explore deep crevices in the sparse reef (depth 150–200m) if Twisty Bridges proves fruitless. Cysts can be found on the underside of overhangs.
- Use a scanner room if available. Craft a scanner room (requires nacre, gold, and lithium) and upgrade it with a range upgrade. Set it to scan for “necrolei cyst” to mark exact positions on your HUD.
Tip: Cysts are often hidden behind kelp or inside small caves. Listen for a distinct pulsating sound—it becomes louder as you approach.
Harvesting Safely
Once you’ve located a cyst cluster, approach cautiously. The necrolei plant is non-hostile, but several predators patrol its territory:
- Bonesharks (aggressive, can damage vehicles)
- Crabsquid (emit EMP shockwaves; disable electronics)
- Mesmers (rare, confuse and draw you toward them)
To harvest:
- Equip your knife and swim within arm’s reach of the cyst.
- Use the
left-click(or equivalent interact key) to cut the cyst free. It will detach and float upwards. - Quickly grab it before it drifts away. If you’re using a Prawn Suit, the drill arm can collect multiple cysts in one pass.
- Store the cysts in your inventory (stack up to 10) and retreat to a safe distance.
If attacked, deploy a decooy torpedo or use the Propulsion Cannon to repel the creature.
Crafting Strong Acid
Return to your base or lifepod fabricator. Open the crafting menu and navigate to Resources → Chemicals → Strong Acid. The recipe requires:
- 3 × Necrolei Cyst
- 1 × Battery Acid (crafted from 2 × Creepvine Seed Cluster + 1 × Copper Ore)
Select “Craft” and the strong acid will be produced instantly. Store it safely—strong acid is toxic and will damage your inventory if you have more than 5 units. You can now use it to fabricate the tadpole vehicle engine upgrade or other advanced modules.
Common Mistakes
- Confusing necrolei cysts with other glowing resources. Some players mistake ruby or deep shrooms for cysts. Cysts are the only translucent purple spheres attached to their plant.
- Harvesting too early. Attempting to collect with only a basic O₂ tank leads to drowning. Always bring at least 135 seconds of oxygen or a vehicle.
- Ignoring hostile fauna. Players fixated on the cyst often get mauled by a boneshark. Scan the area first using the
F1(or equivalent) to identify threats. - Not using beacons. The Twisty Bridges biome is labyrinthine. Without a beacon, you may never find the same cyst cluster again.
- Overstocking strong acid. You only need a few units for the tadpole vehicle. Excess acid takes up inventory space and can damage your items.
Summary
Finding necrolei cysts in Subnautica 2 requires patience, the right equipment, and knowledge of their spawning patterns. Focus on the Twisty Bridges and sparse reef biomes near thermal vents, use a scanner room if possible, and always watch for predators. With 3 cysts and 1 battery acid, you can craft strong acid in any fabricator, unlocking the essential tadpole vehicle upgrade. Remember to mark locations with beacons, harvest with care, and avoid common pitfalls like confusing cysts with other resources. Happy diving!