What Biomass Is
Biomass comes from biomass growths, organic deposits found around planets. In demo footage, COSMO announces them with lines like "I'm authorizing a biomass growth". Players then harvest them like other resources.
The developer has not published how much Biomass each growth gives. One creator admitted they did not know how much they needed to harvest. We will add yields if official numbers appear.
Biomass at a Glance
The confirmed facts about Biomass.
- Source: biomass growths on planets.
- Use 1: Mod upgrades, with Research Points.
- Use 2: heals 10 HP when a growth is fully harvested.
- Finding it: planet cards and COSMO call-outs.
- Yield per growth: not published.
Use 1: Mod Upgrades
Dev Log #1 adjusted the Mod tree order and upgrade prices for the demo. It also states that Mod upgrades now require Biomass alongside Research Points. Without Biomass, you cannot push your Mods past their base level.
Mod upgrades show levels 1 to 3 in the current build. Pair this with your Mod Deck so you upgrade Mods you will actually draw. Our Research Points guide covers the other half of the cost.
Use 2: Healing
The dev log adds a second use: Biomass now heals 10 HP when fully harvested. That makes growths a useful top-up during or between waves. Finish the harvest to get the heal.
This is one of few healing sources described officially, alongside abilities like Finn's Play Dead. Use growths near your base when the swarm wears you down. Keep an eye on incoming waves while you harvest.
Finding Biomass
The Steam page says treacherous planets hold the best materials, and the higher the risk, the greater the rewards. Demo footage shows planet cards listing a Biomass challenge alongside other details. Choose those jobs when you need it.
Once planetside, growths can appear around the map, and COSMO calls them out. One creator found several growths on a fuel pump job. Use drone view to check for enemies before heading out to harvest.
Collecting It Efficiently
Harvest with your mining laser, then return the resource to the Collector. The tutorial shows the general rule: resources dropped on the pipeline travel back on their own. Extending pipeline toward growth clusters saves trips.
In co-op, one player can harvest while others defend. One creator said this kind of job is where a group really helps. See our pipeline guide for routing.
Planning Biomass Runs
Because Mod upgrades need Biomass and Research Points, a short run focused on growths can unlock your next upgrade. Check planet cards for a Biomass listing before launching. Riskier planets tend to hold better materials.
Remember the main objective still decides whether you succeed. Harvest growths between waves rather than during a push. Return to the Collector before launch prep ends.
Biomass and Healing in Combat
The 10 HP heal from a fully harvested growth is small but useful. It helps characters with low HP, like Finn, stay in the fight. Combine it with your character's own survival tools.
Finn's Play Dead provides invulnerability and stronger healing while down. Revives from teammates give a second chance in co-op. Biomass growths add one more option when the swarm closes in.
What We Still Don't Know
The developer has not published Biomass yields per growth or exact Mod upgrade costs. Mod levels show as 1 to 3 without numbers in the demo. We will not guess these values.
Early Access on November 2, 2026 may change prices again, as the dev log already adjusted upgrade prices once. We will update this page with verified numbers. Check back after launch.
Biomass and Other Resources
Biomass is one of several materials. Electrium crystals and titanium ore unlock items such as the sniper rifle, while credits from mining pay for build kits. Each has its own role in progression.
Read our Electrium guide for the volatile crystal resource. Demo progress, including stored resources, will not carry over to Early Access. Plan your Mod upgrades again from scratch at launch.
Frequently Asked Questions
What is Biomass used for in GRAVHOUNDS?
Mod upgrades, which cost Biomass plus Research Points, and healing: a fully harvested growth heals 10 HP.
Where do you find Biomass?
In biomass growths on planets. Planet cards show jobs that reward it, and COSMO announces growths in missions.
How much Biomass does a growth give?
No official figure has been published.
Does Biomass heal in co-op?
The dev log says a fully harvested growth heals 10 HP; it does not specify more.
Is Biomass needed for weapons?
Officially it is tied to Mod upgrades; weapon costs shown in demo footage use other materials.
Official Trailer
Sources and Further Reading
- Dev Log #1 – Playtest to Demo Changes (official, Oct 7, 2026)
- GRAVHOUNDS on Steam (official store page)
- Gravhounds Revealed – Xbox Wire (Josh Holmes, Octopus Panic)
- GRAVHOUNDS – Official Gameplay Overview (ID@XBOX)