- Action
- Indie
- Simulation
- Early Access
Game
Primordialis
Primordialis is a physics-based roguelike fish builder. Unleash your creativity to defeat creatures using venomous tentacles, electrical shocks, or exploding children. The possibilities are endless. Explore the primordial depths to reveal its secrets and discover what lies beyond.
Primordialis is a physics-based roguelike fish builder. Unleash your creativity to defeat creatures using venomous tentacles, electrical shocks, or exploding children. The possibilities are endless. Explore the primordial depths to reveal its secrets and discover what lies beyond.
About Primordialis
- Released
- July 2025
- Platforms
- PC (Microsoft Windows)
Where to get it
Release, studio and platform data from IGDB. Store links go to the sellers, not to us. We do not sell games and we do not host files.
Browse everything
Sorted, filterable and paged. Every link goes to the author’s own download.
From the developers
Official announcements, newest first. Posted on Steam.
- Community AnnouncementsPrimordialis Early Access RoadmapHere's a general overview of my current plans for early access development. This list is not in chronological order aside from the dividing lines, and plans may change slightly
- Community AnnouncementsPrimordialis v0.2 beta updateHello everyone! It's been a while so I should probably explain why this has taken so long, which is mostly me getting caught in a loop of some things taking longer than expected and feeling like I need to have more new things prepared to justify the time. This is somewhat of a normal development pattern for me where towards the start of an update I'll work on internal stuff that is important bu...
- Community AnnouncementsPrimordialis Soundtrack now available!The Primordialis original soundtrack is now available on Steam and other platforms!To celebrate the game is on sale for 35% off, and if you buy the game and soundtrack together you can get another 25% off the bundle.The soundtrack is also available for purchase and streaming onspotify: youtube:
- Community AnnouncementsPrimordialis v0.1Happy Holidays!Primordialis v0.1gameplay changes & features:- Final music polish from Phrakture- A couple new creatures from Keith- Shrunk 4th and 5th biomes- Reduced number of entrances from first biome to the dark biome to prevent new players from focusing on it too much- Most combo cells have been removed from non-bosses- Added some Halloween creatures, enabled Oct 24 to Nov 1 in your local...
- Community AnnouncementsCleanFall+Primordialis bundleI'm happy to announce that CleanFall and Primordialis can now be purchased together for an extra 10% discount! CleanFall is an awesome new rogue-lite that just released today in early access! If descending into a mysterious hole on a ship that you build interests you at all I highly suggest that you check it out. The ship building is very fun with lots of creative options, and there are many di...
- Community AnnouncementsPrimordialis beta branchYou can now access the Primordialis beta branch by right clicking the game in your steam library > Properties > Betas then set Beta Participation to the beta branch. The beta branch will have previews of upcoming updates. The beta will receive updates more frequently, but some things may not be fully tested. Currently the beta branch has a couple new cell types, additional symmetry modes in the...
- Mods indexed
- 777
- Versions
- 0
- Newest tracked
- none yet
- Most disruptive update
- No breakage data for this game
of 2.2k on Steam Workshop
Most downloaded
Measured from the source's own counts, summed across every release.
- Guillotine v2has a strong and fast bite. capable of dealing impact damage by swinging its head around and pushing creatures away with its tail1.9k downloads
- (Supercharged Laser Cannon) Stargazer M2A new and improved version of my Stargazer laser cannon! Now much more reliable, powerful, and stylish than its precursor of the M1. Hope you like it!1.8k downloads
- The RotThe rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot consumes. The rot c...1.5k downloads
- XM-05 Thanatosrecreation of XM-05 Thanatos from Terraria Calamity Mod i made a while ago1.2k downloads
- super acid launcher mk2its like the old one but smaller and it has all the unnecessary parts taken away the mechanism that charges the acid cells and keeps them turned off when not in use is much smaller and stronger and could be used to charge other cells but acid is the best one anyways so yea1.2k downloads
- Lava ScuttlerBurn your foes with angry heat drones! The Lava Scuttler is a ~2k biomass creature with built in heat protection, mostly to save itself from friendly fire. No mutations or combo cells required, though it works best with budding while avoiding steady regeneration and parasitism. Triple voltage can...1.1k downloads
- Cold FusionSet the world on fire with a cold reactor pumping radiant cells! Plus pretty sparks for those rare cases heat alone isn't enough. No combo cells required. Requires a tiny bit of setup to function. A few seconds after spawning in this creature in the game world (after the middle thermoelectric cel...1.0k downloads
- Needle-snakeA frail serpent-like creature that can impale (and occasionally pin) smaller enemies or lodge itself into larger enemies1.0k downloads
- Homing Spike LauncherThis Creature launches 4 homing spike missiles that latch on to targets. It took me a while to figure out the mechanics to make them follow properly and not hits its own body. Thankfully i was able to observe some of the premades and figured out how to fix it, needing only a seeker cell on the mi...995 downloads
- Apathy12th iteration. slightly larger than the previous iteration. still not the biggest.954 downloads
- MegamouthA large apex predator that devours its prey whole. includes the current version plus the previous version which was formerly "Mosasaur". The centipede shown in the fifth video has buffed armor and regen, which I may be uploading soon. attacks consist of a somewhat reliable but decent bite, rammin...945 downloads
- Devourer Of Gods (Calamity)"It ain't over yet, kid." (Second picture has a basic fish for scale to the left)944 downloads
- Black HoleTry to kill it! This thing is made of really dumb combo cells. It will kill ANYTHING that touches it!916 downloads
- Pulse Reactor (Updated)A modern version of the Pulse Reactor design. Uses a new reactor configuration of an old design that oscillates between + and - maximum voltage, about 10^36V. The breakaways capture only negative voltage, which is flipped to positive for use in heat sink + laser combo cells, since plain lasers in...848 downloads
- CM-pale fin764 downloads
- Aquatic Scourge (Calamity)the Aquatic Scourge from the Terraria Calamity mod741 downloads
- Apathy (small)the 11th iteration of apathy. significantly smaller than 9. but atleast this can be loaded with minimal issues.695 downloads
- Leviathan - Rain WorldLeviathan from Rain World! Seek to open mouth, use ability to snap shut. Can one-shot most enemies. Credit to Gmod_Dima from the Primordialis Discord for helping me figure out the bite mechanic :o)679 downloads
- The Swamp QuaternaryHe is like a thingy with venom, yeah.646 downloads
- Fool's PreyA creature that is native to dark caverns and mimics small prey to attract other creatures.555 downloads
- Countdown timer (3 to 0)A simple circuit I made for the game trailer :D538 downloads
- The SingularityDo Not!! Judge a book by its cover. The is my greatest creation, also this is a SAND BOX ONLY Build. Find a open area with lots of enemies click space and then sit back and watch as it collapses in to a black hole and a big wave of gravity sucks up all the enemies in a HUGE radius. Killing them a...535 downloads
- Shock ScuttlerSuper charged shocks can deal with most foes and the drones can help with pesky runners or clearing a wider area. Tap left click for drones, hold left click to super charge your electricity (prevents drones from respawning, but honestly they'd just get killed by the shocks anyway). Chain Lightnin...526 downloads
- Toxic ScuttlerThe Toxic Scuttler fits its name perfectly. Venomous phased drones sap enemies in relative safety or outright kill them with the right Mutagenic Poison mutation (recommend selecting Breakaway Cells). Side jets slightly pushes the small drones away from the main body making them less likely to poi...475 downloads
Browse all 777 Primordialis mods Sortable by downloads, rating and date.
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Why Primordialis mods break
A mod is compiled against one version of a game. When the game updates, anything that reached into the parts that moved stops working, and it usually stops working silently rather than with a message that explains itself.
That is what the table above counts. It is not a guess: each row is a mod the community has reported as broken by that specific release. The number is a fair measure of how disruptive an update was, and it is the reason people delay updating a game they have modded heavily.
Common questions
Does IndexGG host Primordialis mods?
No, and it never will. Every download link points at the author's own page on Nexus, GitHub, CurseForge or wherever they published it. We index the ecosystem; the files stay with the people who made them.
Where does the compatibility data come from?
From the communities that maintain it in the open, not from guesswork. Each claim carries how it is known, so a reported breakage is never presented as though the author said it.
Why is a mod listed as broken when it works for me?
Compatibility depends on your exact game version and the rest of your load order. A mod marked as broken in one release may work fine on an older one, which is exactly why the version is recorded next to the claim rather than a bare yes or no.