The delightfully named Subnautica 2 Lucifer Rotsac is required to make rubber, which itself is used in a number of crafting recipes. This is one of the many new resources this sequel introduces, and it's not immediately obvious where it's found.
Luckily, it's far easier to find than you might think, it just looks a little different in the world than it does in your blueprint list. It can also be found very close to your lifepod so, once you know what you're looking for, you won't have any trouble finding it. Here's where you can find Lucifer Rotsac in Subnautica 2, and what it looks like.
Where to find Lucifer Rotsac in Subnautica 2
Subnautica 2 Lucifer Rotsacs are glowing orange orbs that can be found nestled within teal Cradle Shootroot. They can be found lying around the ocean floor in abundance in the area around your lifepod. The Lucifer Rotsacs themselves can be picked up easily, while Shootroot must be cut with a survival multitool and can then be used to craft fiber.
They're much harder to find in the later game, so be sure to stock up before you start venturing too far from the starting area.
Once you've found them, Lucifer Rotsacs can be turned straight into rubber at any fabricator, including the one on your lifepod. However, there are some materials that require a fully functioning Subnautica 2 fabricator or processor to be crafted.
Subnautica 2 Silver is among some of the other harder-to-find resources in the survival game, so check my guides on where to find that, Fibrous Pulp, and Habitat Builder fragments.
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