API and libraries for Minecraft 1.21.1
Version:
All versions
- All
- 1.21.8
- 1.21.7
- 1.21.6
- 1.21.5
- 1.21.4
- 1.21.3
- 1.21.2
- 1.21.1
- 1.21
- 1.20.6
- 1.20.5
- 1.20.4
- 1.20.3
- 1.20.2
- 1.20.1
- 1.20
- 1.19.4
- 1.19.3
- 1.19.3
- 1.19.2
- 1.19.1
- 1.19
- 1.18.2
- 1.18.1
- 1.18
- 1.17.1
- 1.17
- 1.16.5
- 1.16.4
- 1.16.3
- 1.16.2
- 1.16.1
- 1.16
- 1.15.2
- 1.15.1
- 1.15
- 1.14.4
- 1.14.3
- 1.14.2
- 1.14.1
- 1.14
- 1.13.2
- 1.13.1
- 1.13
- 1.12.2
- 1.12.1
- 1.12
- 1.11.2
- 1.11.1
- 1.11
- 1.10.2
- 1.10.1
- 1.10
- 1.9.4
- 1.9.3
- 1.9.2
- 1.9.1
- 1.9
- 1.8.9
- 1.8.8
- 1.8.7
- 1.8.6
- 1.8.5
- 1.8.4
- 1.8.3
- 1.8.2
- 1.8.1
- 1.8
- 1.7.10
- 1.7.9
- 1.7.8
- 1.7.7
- 1.7.6
- 1.7.5
- 1.7.4
- 1.7.2
- 1.6.4
- 1.6.2
- 1.6.1
- 1.5.2
Spell Power [1.21.1] [1.21] [1.20.1] [1.19.2] [1.19.1]
Spell Power supercharges your sorcery by linking it to school attributes. You can pump up fire/frost damage, slash cooldowns, and spike crits for those screen-shaking, pulse-pounding explosions. I evolved my puny sparks into arena-shakers, feeling every upgrade hit with visceral power. Cinematic FX dazzle, and configs let you tune output to perfection. Tactical counters add smart depth; your wizard path quickly ascends to straight god-tier dominance. This rush delivers the ultimate power fantasy – dominate foes with explosive, over-the-top magic!
More RPG Library [1.21.1] [1.21] [1.20.1]
More RPG Library is the essential secret sauce for massive RPG epics in Minecraft. It flawlessly integrates custom attributes, status effects, Spell Engine boosts, and a suite of tools for seamless quest, skill, and loot systems. I wired it to a few class packs, and suddenly – BAM – I had branching skill trees, meaningful progression, and epic drops pulsing with real magic. It's a developer's dream for crafting mini-MMOs inside your world; vanilla instantly feels alive and deeply interactive. Role-players, this elevates any addon to god-mode depth – go craft your own legendary saga!
Spell Engine [1.21.1] [1.21]
Spell Engine catapults you into wizard-god territory! This tool lets you craft data-driven spells and bind them to any weapon or tome. You can blast massive fireballs, freeze enemies with ice shards, or use wild triggers for teleportation, all with stunning visuals and particles. I’ve chained insane combos that explode in glorious chaos, even tweaking sounds for that perfect punch. The Creator API ensures casts remain unpredictable and badass. It's the supreme magic playground for everything from quick zaps to ritual mega-nukes. Trinket buffs amp the power; battles ignite endless adrenaline. Sling spells like a boss!
JasonConfig (jsconfig) [1.21.1] [1.20.1]
Let’s be honest: if you're just playing the game, you don't even need to look at this–it’s a library mod. It basically swaps out Forge's standard config system for one powered by JSON, which is way more stable and doesn't freak out over things like empty lists. I’ve seen Forge configs break for the dumbest reasons, but this one handles complex stuff like Minecraft classes without a hitch. It’s a backend workhorse for versions like 1.20.1 and 1.21.1. If a mod you're using requires it, just toss it in your folder and forget it’s there.
Blueprint [1.21.1] [1.20.1] [1.20] [1.18.2] [1.16.5]
Okay, look–Blueprint isn't "fun" to play with because it doesn't do anything you can see. It’s just the technical glue for the Team Abnormals mods (like Autumnity or Neapolitan). But honestly, without it, those mods would probably crash your game or feel clunky. I think of it like the backend of a website–if it’s doing its job well, you won't even know it’s there. If you’re building a pack that’s supposed to feel like "Official Minecraft 2.0," you’re going to end up downloading this eventually.
Accessories CC Layer [1.21.1] [1.21] [1.20.4] [1.20.1]
Accessories CC Layer is the invisible fix every skin-nerd and mod-junkie has been dreaming of! This tiny but mighty addon bridges the gap between the Accessories API and Custom Player Models (CPM), finally allowing your cosmetic layers to render correctly without those annoying texture glitches. I rigged up a complex character with 3D gear and capes, and bam – everything stayed perfectly synced during emotes and combat. It’s a total game-changer for roleplay and fashion, ensuring your custom look actually stays custom. Essential for 1.20.1 and 1.21.x packs where looking legendary is just as important as the grind. Style, saved!
Aaron [1.21.1]
The enigmatic observer has arrived. Aaron introduces a mysterious NPC that interacts in subtle, pattern-based ways. I found myself obsessively trying to crack his code; occasionally, he'd drop a cryptic hint or a rare item. Gameplay is enriched with deep curiosity and constant surprise. This mod is mandatory for players who value discovery, hidden lore, and thought-provoking depth. Having a sentient, unpredictable element in your world creates a lingering sense of mystery that makes you question every shadow and strange occurrence you encounter on your travels.
Bundle API [1.21.1] [1.21]
Bundle API is the silent hero that vastly improves inventory handling for mods that use bundled items. I noticed fewer edge-case bugs and far smoother storage interactions in my big packs. It's highly technical but pays off for the player: less clutter, fewer drop losses, and cleaner workflows. For anyone building complex mod combinations, this backend helper reduces friction and improves overall playability by quietly ensuring that complex item management systems function reliably and efficiently.
Puffish Skills [1.21.11] [1.20.2] [1.20.1] [1.19.4] [1.18.2]
Puffish Skills layers meaningful abilities onto companions – from strong passive buffs to flashy attacks – making the training process deeply impactful. I unlocked niche skills, tested complex synergies, and devised loadouts that perfectly complemented my fighting style. They instantly evolved from cute sidekicks into tactical, full-fledged teammates. The progression loop is simple and addictive: teach, test, tweak, triumph and the depth of customization ensures that no two companion loadouts ever feel exactly alike.
Puffish Attributes [1.21.11] [1.20.2] [1.20.1] [1.19.4] [1.18.2]
Puffish Attributes grants companions unique personalities via core stats. Tweaking health, speed, or charisma made each pet behave distinctly; I adapted my tactics to their strengths. Watching a favored companion survive a brutal fight was a genuine source of pride. It transforms pets from background fluff into strategic, emotionally attached partners, making survival runs feel gentler and unexpectedly engaging by forging powerful, unique bonds based on tactical utility and shared survival.
Not installed yet OneLauncher?
Download the launcher, install mods, skins and capes in one click. Play on any servers. And free skins and capes will make you stand out in the game among your friends!
Verified VirusTotal
Friendly Support
Have a question about the launcher or services? Contact us in our Telegram group. We will help you with any questions! We are in touch 24/7






