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    2,054,198 files checkedFiles from Modrinth and CurseForge we downloaded and checked. Counted on 25 Oct 2026.636,163 files with their code readFiles whose code we turned back into readable code and read, in an isolated environment. Counted on 25 Oct 2026.269,438 projects gradedProjects with a letter from A to F. Counted on 25 Oct 2026.
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    © 2026 ModgradeNot an official Minecraft product. Not approved by or associated with Mojang or Microsoft.

    Pyrellium

    Mod

    New Nether biomes bring fiery forests, icy caves, and strange creatures.

    A98/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 1.21.11
    • ModpacksIn 20
    • ReleasesLatest 8 Oct

    Download

    pyrellium-0.4.1-1.21.11.jar

    Released 5 Oct 2026 · 662.5 KB

    Passed: our checks found nothing harmful in this file.

    Download
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade A

    How grades work

    Strengths

    • Security checks passed
    • Regular releases for Minecraft 1.21.11, a version many recently updated mods still support
    • Stable releases
    • Public source code and issue tracker
    • Around for years

    Points lost

    • Under 5 million downloads−1 point
    All 11 criteria

    • Maintenance

      Full points27 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.2 weeks ago (8 Oct 2026) 12 / 12
      Supports popular versionsWhether the project has a file for a Minecraft version that 15% or more of the popular mods updated in the last 6 months also support. A version many modpacks use, like 1.20.1 or 1.21.1, also counts after a release in the last 12 months.1.21.11 on Fabric, 1.21.1 on NeoForge. 15% or more of the popular mods updated in the last 6 months also have files for 1.21.11. Latest Minecraft: 26.3. 9 / 9
      Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 14 of the last 24 months 6 / 6

    • Stability

      Full points22 / 22
      Removed from modpacksHow many modpacks removed it in a later version of the pack. We can only see this in modpacks with two or more versions. A pack that swaps it for another edition of the same project, or that is rebuilt from scratch, does not count.None of the 17 modpacks with two or more versions removed it 10 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.1 of its 21 releases in 2 years needed a quick fix (5%) 7 / 7
      Known conflictsHow many projects say they do not work with it, compared with how widely it is used. Packs, small projects, forks, ports, add-ons, alternatives and old versions do not count.None 5 / 5

    • Transparency

      Full points10 / 10
      Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · Theawsomelamp/pyrellium 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · Theawsomelamp/pyrellium 3 / 3

    • Popularity

      1 point lost3 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.22,646 3 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.18 months, 40 releases 8 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 4 latest files for recent Minecraft versions. See Security
    Total98 / 100

    69.6 of the 71 points that apply = 98 out of 100. The points above are rounded to whole numbers.

    Images

    • Crystal forest
    • Mushroom wastes
    • Infested valley
    • Burning Grove
    • Ghostly Woods
    • Frostburn Valley

    About

    Pyrellium is a vanilla-plus Nether overhaul that adds nine biomes to the existing Nether, bringing new environments, exploration challenges, hazards, and resources. Its biomes include Blackstone Springs, Burning Grove, Crystal Forest, Frostburn Valley, Ghostly Woods, Infested Valley, Monolith Plains, Mushroom Wastes, and Quartz Caverns, ranging from a comparatively calm crystal woodland to icy valleys and spider-haunted caverns. Each area has distinctive terrain and hazards: the Burning Grove has trees that yield a craftable wood set and pyrolilies that can set visitors alight, while Frostburn Valley's black ice causes a freezing effect. Infested Valley is threaded with silk that slows movement, and Mushroom Wastes features poisonous spores, wall and shelf mushrooms, and bounceshrooms that launch anything landing on them. In Monolith Plains, volatile bomb plants can explode when disturbed; fully grown plants mined with Silk Touch can yield throwable bomb flowers, whose explosions damage entities without breaking blocks. The mod also adds Nether resources and equipment: opal grows in geodes and serves as a crafting and armor-trim material, while an opal spyglass can mark a block's position and an opal tiara makes ghasts neutral to its wearer. Other additions include amethyst and opal arrows that shatter on impact, a mushroom cap that protects against Mushroom Wastes spores and shortens poison effects, and headstones in Ghostly Woods that can be written on like signs. World-generation details extend into existing Nether biomes with features such as basalt iron ore, fallen logs in crimson and warped forests, gilded blackstone patches, and bones in soul sand valleys. Many biome-generation options and gameplay values, including bounce strength, plant explosions, and spores' effects, can be adjusted through the mod's configuration. Pyrellium is designed to work alongside major Nether mods and datapacks, fitting into both vanilla and modded worlds.

    Written from Modrinth , CurseForge and the GitHub README . How we write it

    In-game changes

    Changes the game's code in 8 areas: Mobs and their behaviorChanges 4 game code files in this area: mobs, animals, villagers, projectiles and how they move and act., Rendering and graphicsChanges 4 game code files in this area: drawing mobs, items, particles and textures on screen., Inventory and itemsChanges 2 game code files in this area: items, chests and other containers, crafting and enchanting., PlayerChanges 2 game code files in this area: your character: movement, abilities, hunger and controls., World generationChanges 1 game code file in this area: terrain, biomes and structures made when new land is created., User interfaceChanges 1 game code file in this area: menus, screens, tooltips, the chat window and the in-game overlay., Game data and resourcesChanges 1 game code file in this area: recipes, tags, advancements, language files and other game data. and Game coreChanges 1 game code file in this area: the main loop, lighting and other code the whole game uses..

    Adds 88 blocks, 12 items, 1 mob, 4 boats, 2 projectiles, 9 biomes, 2 structures, 1 enchantment, 44 recipes and 4 loot tables.

    Counted from the names and data files in the mod, so the list may not be complete.

    Keeps all of vanilla Minecraft's textures, models and sounds.

    Often used with it

    See all 30
    FerriteCoreAMod MenuAReese's Sodium OptionsALithiumAFarmer's Delight RefabricatedA

    Details

    Creator
    Lankaster
    License
    Creative Commons Attribution 4.0 International
    Downloads
    23K
    Created
    24 Apr 2025
    Official pages
    Modrinth , CurseForge
    Links
    Source code , Issues , Wiki

    Security

    No harmful code found

    We checked its files and read their code, without running it.

    What it can do on your computer

    Creates settings files
    The mod keeps its settings in the config folder of your game, where you can change or delete them. 1 file in your config folder.

    Why we show this: a mod runs on your computer like any program, so harmful code in it can take your accounts or files. Our checks look for known signs of harm. They cannot prove that a file is harmless. In the grade: malware means no grade, and a Warning in a latest file for a recent Minecraft version lowers it.

    How we checked · All 6 latest files checked, last on 16 Oct 2026
    • FilesWe download the files from Modrinth or CurseForge and look at what is inside them and what their code can do, without running them. Fixed rules tell what is harmful.
      6 latest files: the newest file for each Minecraft version and loader. The answer above is about the 4 for recent versions. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks. See each file in Releases
    • Their codeWe turn the code of the files back into readable code and follow what it does, without running it. This shows what it downloads, what it sends and where your login goes.
      Read without running it
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares that the project reads or edits things on your system outside the game. Since 13 Aug 2026, Modrinth's rules require it when this applies.
      Nothing declared about your system outside the game.
    • Looked for, not foundWe looked for these in the file and did not find them.
      The internet, folders outside the game, other programs, updating itself, the webcam or microphone, an AI service.

    Privacy

    We found nothing it sends

    We read its code without running it: it contacts no web address while you play.

    Why we show this: a mod can send things about you over the internet, like your player name or your login. Contacting an address to check for updates or download files sends nothing about you. Not in the grade: sending data can be normal for what a mod does.

    How we checked · All 4 files read
    • Files readWe read the code without running it. We list each web address the code contacts while you play, and what it sends. Code that is never used is left out.
      The code of all 4 files, for recent Minecraft versions. See each file in Releases
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares crash reports, usage data and advertisements. Since 13 Aug 2026, Modrinth's rules require it when a project collects data on its users or shows advertisements.
      Nothing declared about crash reports, usage data or advertisements.

    AI

    No sign so far that AI was used to make it

    We looked for AI tools in its texts, files and images and found none.

    We have not read its code history yet.

    No sign of AI in the game

    We found no AI service, AI library or AI model file in its code.

    Why we show this: some players and servers avoid projects made with AI, and AI in the game can send what you write to an online service. Not in the grade: using AI does not tell whether a project works well or is kept up to date.

    How we checked · 5 places read
    • Author on ModrinthThe disclosure form on Modrinth. Since 13 Aug 2026, Modrinth's rules require it when a substantial part of the code is AI output, when an asset is mainly AI output, or when the project or its page relies on generative AI.
      No AI content or AI features declared.
    • Code historyThe public code on GitHub: who made each change, credit lines such as "Co-authored-by", and its files.
      Not read yet
    • Description and changelogsThe description, project page and newest changelogs: sentences saying an AI tool was used, and text pasted from an AI chat.
      Nothing found
      2 of 40 changelogs read
    • Its filesFiles that AI coding tools leave behind (like AGENTS.md), and the texts inside the files you download.
      Nothing found
    • Images in its filesHidden data in the images of the files you download, where AI image tools write their name and settings.
      Nothing found
      137 images read
    • Code of the modThe code and files of the mod, read without running it: addresses of AI services, AI libraries, AI model files and a place for your own AI key.
      No AI service, AI library or AI model file
      128 code files read

    Compatibility

    See all 40 files
    Fabric
    NeoForge
    1.201.2126.126.3

    Point at or tap a version to see its loaders.

    Runs onWhere to install it: in your game, on the server, or both. As the author says on Modrinth.Needed in your game and on the server, or you cannot join.
    RequiresProjects you must also install for it to work. From the author's lists for its files for recent Minecraft versions, or from its project page.Nothing
    OptionalProjects it can work with but does not need. The author lists them.Nothing
    IncludesProjects packed inside its files.Nothing
    Speed of updatesHow fast it gets a file for new Minecraft versions, on average, compared with similar projects. Not part of the grade.It has no file for Minecraft versions newer than 1.21.11. Many recently updated mods still support 1.21.11.

    Related projects

    Projects that need Pyrellium to work.

    ProjectTypeDownloadsGrade
    Big Globe Compat - PyrelliumBData pack246 downloads

    Modpacks using this project

    Find modpacks with it

    Modpacks that include Pyrellium in at least one of their versions, most downloaded first.

    ModpackDownloadsLast version with it
    Shewolf's Origins30K downloadslast version with it 16 Oct 2025Better Than Beta7.7K downloadslast version with it 14 Aug 2025WildLight3.7K downloadslast version with it 30 Aug 2026Neostalgia: Beta Redux3.1K downloadslast version with it 5 Oct 2026Convergence2.1K downloadslast version with it 27 Sep 2026Better of Fabric 31.3K downloadslast version with it 10 Jun 2025BiteForce Cobblemon1.1K downloadslast version with it 25 Sep 2026Evermere1.1K downloadslast version with it 13 Sep 2026BiteForceMC Cobblemon918 downloadslast version with it 25 Sep 2026Silver Edition741 downloadslast version with it 11 Oct 2025
    1 to 10 of 2012

    Often in the same modpacks

    Mods that modpacks often add together with Pyrellium. Share: how many of the modpacks with Pyrellium also have that mod.

    ProjectTypeShareGrade
    FerriteCoreAModin 85% of the modpacks with PyrelliumMod MenuAModin 80% of the modpacks with PyrelliumReese's Sodium OptionsAModin 70% of the modpacks with PyrelliumLithiumAModin 65% of the modpacks with PyrelliumFarmer's Delight RefabricatedAModin 55% of the modpacks with PyrelliumDynamic FPSAModin 55% of the modpacks with PyrelliumAmendmentsAModin 55% of the modpacks with PyrelliumNether Depths UpgradeAModin 50% of the modpacks with PyrelliumFriends&Foes (Fabric/Quilt)AModin 50% of the modpacks with PyrelliumRegions UnexploredAModin 50% of the modpacks with Pyrellium
    1 to 10 of 30123

    Latest files

    The newest file for each Minecraft version and loader. The files for recent versions come first. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks.

    MinecraftLoaderVersionSecuritySendsRequires
    1.21.11·Fabric0.4.10.4.1 · pyrellium-0.4.1-1.21.11.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.1·Fabric0.4.10.4.1 · pyrellium-0.4.1-1.21.1.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.1·NeoForge0.4.1-neo0.4.1-neo · pyrellium-0.4.1-1.21.1-neo.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·Fabric0.4.10.4.1 · pyrellium-0.4.1-1.20.1.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.20.2·Fabric0.2.00.2.0 · pyrellium-0.2.0.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20·Fabric0.1.20.1.2 · pyrellium-0.1.2.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.

    40 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21.1The latest file for its Minecraft version and loader·NeoForge0.4.1-neo0.4.1-neo · pyrellium-0.4.1-1.21.1-neo.jar (main file)·8 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 636.3 KB
    1.21.11The latest file for its Minecraft version and loader·Fabric0.4.10.4.1 · pyrellium-0.4.1-1.21.11.jar (main file)·5 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 662.5 KB
    1.21.1The latest file for its Minecraft version and loader·Fabric0.4.10.4.1 · pyrellium-0.4.1-1.21.1.jar (main file)·5 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 645.4 KB
    1.20.1The latest file for its Minecraft version and loader·Fabric0.4.10.4.1 · pyrellium-0.4.1-1.20.1.jar (main file)·5 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 649.4 KB
    1.21.1·NeoForge0.4.0-neo0.4.0-neo · pyrellium-0.4.0-1.21.1-neo.jar (main file)·24 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 631.0 KB
    1.21.11·Fabric0.4.00.4.0 · pyrellium-0.4.0-1.21.11.jar (main file)·14 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 656.0 KB
    1.21.1·Fabric0.4.00.4.0 · pyrellium-0.4.0-1.21.1.jar (main file)·14 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 639.2 KB
    1.20.1·Fabric0.4.00.4.0 · pyrellium-0.4.0-1.20.1.jar (main file)·14 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 643.1 KB
    1.21.11·Fabric0.3.30.3.3 · pyrellium-0.3.3-1.21.11.jar (main file)·25 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 585.8 KB
    1.21.1·Fabric0.3.30.3.3 · pyrellium-0.3.3-1.21.1.jar (main file)·25 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 571.7 KB
    1.20.1·Fabric0.3.30.3.3 · pyrellium-0.3.3-1.20.1.jar (main file)·25 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 576.2 KB
    1.21.11·Fabric0.3.20.3.2 · pyrellium-0.3.2-1.21.11.jar (main file)·11 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 575.1 KB
    1.21.1·Fabric0.3.20.3.2 · pyrellium-0.3.2-1.21.1.jar (main file)·11 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 570.6 KB
    1.20.1·Fabric0.3.20.3.2 · pyrellium-0.3.2.jar (main file)·11 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 575.1 KB
    1.21.11·Fabric0.3.10.3.1 · pyrellium-0.3.1-1.21.11.jar (main file)·12 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 542.7 KB
    1.21.1·Fabric0.3.10.3.1 · pyrellium-0.3.1-1.21.1.jar (main file)·26 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 538.4 KB
    1.20.1·Fabric0.3.10.3.1 · pyrellium-0.3.1.jar (main file)·26 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 546.7 KB
    1.21.1·Fabric0.3.00.3.0 · pyrellium-0.3.0-1.21.1.jar (main file)·3 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 533.6 KB
    1.20.1·Fabric0.3.00.3.0 · pyrellium-0.3.0.jar (main file)·3 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 542.1 KB
    1.21.1·Fabric0.2.60.2.6 · pyrellium-0.2.6-1.21.1.jar (main file)·17 Dec 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 468.2 KB
    1 to 20 of 4012

    Quick fixes

    In the last 2 years, 1 release needed a quick fix: a new release within 3 days to fix a problem. This counts in the grade, but it is too few to lose points.

    See them, newest first

    Quick fixesReleases followed within 3 days by a new release that fixes a problem in them.1

    • pyrellium-0.1.1.jar25 Apr 2025Hotfix - Fixed a server only crash when spawning an arrow or…