The lifepod was a cork on a black mirror. I cut the clamps, watched it ride up, and felt a brief, stupid thrill of control. You tense when something you need is only a few strokes away.
On the surface the world looks calm — but the parts you need wait below
I surfaced my lifepod, released the clamps, and set a simple rule: get the Multitool if it keeps the game honest. You can craft a Multitool from Titanium, which spawns in many caves; grab a few sheets and you’ll be set. I don’t lie about experience: the Lucifer Rotsac only started spawning for me after I made the Multitool, though that may have been coincidence.
Head back down to the seabed and scan for the odd, squat plants that hold an egg-shaped item. The egg is a pale lantern in the blue — interact with the plant to pick up the Lucifer Rotsac directly, or cut the plant with the Multitool for pulp and the chance to collect the sphere.
Where do I find Lucifer Rotsac?
You can farm Lucifer Rotsac on the seabed near your lifepod; they appear as small plants with a spherical item perched on top. Check caves and flat sandy areas first — spawn density seemed higher near wrecks and rock outcrops on my playthrough on Steam. If you bought Subnautica 2 on Steam for $29.99 (€30), this is the sort of time-saver you’ll appreciate.
Do I need the Multitool to pick Lucifer Rotsac?
No, you can often pick the spherical item directly by interacting with the plant. That said, the Multitool lets you harvest pulp from the plants and occasionally improves drop consistency. I recommend crafting the Multitool early: Titanium is abundant and the tool opens other recipes in the Fabricator.
On the lifepod the Fabricator is a small, obvious altar
Once you have at least two Lucifer Rotsac, return to the lifepod and open the Fabricator. Drop two of the rotsac into the recipe and craft Rubber — simple, fast, and useful for several midgame builds. Rubber feeds into things like wiring kits and upgrade modules, so it’s worth stocking up.
How do I craft Rubber from Lucifer Rotsac?
Open the Fabricator in your lifepod, choose the Rubber recipe, and use two Lucifer Rotsac per Rubber. Farming is straightforward: return to the same patches of seabed and harvest repeatedly. If you’re running on consoles (PlayStation/Xbox) or PC (Steam), the behavior is consistent across platforms provided you’re on the current build from Unknown Worlds.
Pro tips: set a short circuit of routes from your lifepod — mark a wreck, a rock field, and a cave that repeatedly produces rotsac. Use the Multitool to clear underbrush when spawn rates dip; crafting a handful of Rubber keeps your tech tree moving without frequent backtracking.
If you want rapid stockpiles, treat the seabed like a pantry and rotate harvesting spots rather than stripping one area dry — the game respawns resources faster when you give areas a break.
Now that you know where the rotsac hides and how to turn it into Rubber, what will you build first?