Neoforge Mods for Minecraft 1.21
Browse 747 free Neoforge mods for Minecraft 1.21 — popular picks include Allay in a Jar, PixelColonies: Arcane Journeys, Arcane Adversaries.
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Allay in a Jar
"Allay in a Jar" is a NeoForge mod that allows players to collect rare, uncommon jars dropped by pillager-related mobs, which can be shattered to release an Allay with immersive glass-breaking sounds and magical particle effects.
PixelColonies: Arcane Journeys
Dimension and Exploration Modpack with very hard Bosses and other Creatures, as well as many diffrent dimensions and Quests
Arcane Adversaries
An add-on for Iron's Spells and Spellbooks, adding new spellcasting mobs
Grinding and industrialization GANDI 1
GregTech | Modern Industrialization | 600+ Dungeons | 20+ Taming | 150+ Biomes | 50+ Quests | 20+ Cross-Mod Interactions and Custom Interactions | 450+ Mobs
Entity Dithering
Adds bedrock-like transparency effect to entities. Compatible with any shaders!
GhostTown
Add different kind of Ghost, Biome, Structures
Stranger Things: Upside down
This mod adds content from Netflix series stranger things
Orby
this mod adds a sweet mob that drops a lot of xp
Arcanum Unbound
Arcanum Unbound - is a mod that adds magic and artifact crafting. You as a wizard need to become strongest. The mod has an experimental philosophy of sacrifice and the price of strength, be ready for the challenges.
Temples & Templates
Adding more boss encounters and tools to spice up your minecraft playthroughs!
Lookism
A Minecraft Mod based on Martial Arts and PTJ Verse
Soul Cage
Soul cages for capturing and releasing mobs
CreepyPasta Legends (Java)
Creepy Monsters Awaken, Haunting Players With Dark legends and Fear.
What Lurks Between
A lovecraft inspired magic mod with sanity, biomes, mobs and more.
MGAMES SCPs - DAY ZERO
Build your own site while discovering what's been left behind by the foundation! Many SCPs to Secure, Protect and Contain!
SAO Particles
A mod that spawns particles when mobs die, just like in SAO!
Lost in Dreamland(迷失梦域国)
Add a series of new things.Including a new dimension.
Veil of Vines
A nature and magic mod that adds dozens of unique vine species. Harvest flowers to craft potpourri that repels hostile mobs, and adorn your builds with new decorative blocks. Explore, build, and survive with the power of plants!
Explorer's Haven
Explorer's Haven is an adventure modpack enhancing exploration, biomes, dungeons, and visuals for smooth performance. Discover new landscapes, battle mobs, and enjoy quality-of-life features while preserving Minecraft’s core experience.
Lancelot - Adventures of Tellus
Offering beautiful terrain and content beyond Minecraft's traditional end-game in more ways than one, the Lancelot's main aim is to provide you a tonne of fun! New content for all 3 dimensions, automation and magic, as well as challenging new mobs!
Realms of Runeterra: A tale of Relative Dimensions
New blocks, items, mechanics, stories and adventures await you in a 131072-side block map of Runeterra, the world of the world-wide known MOBA League of Legends. An immersive new dimension paired with procedural generation to spice every new world!
Cryptozoologist
Modification adds a lot of unusual mobs. Some of them, such as Nessie, Bigfoot and razzaks, are inspired by mythology and fantasy books, while others were created without any reference, or at least I think so :)

Snowier Golems
Allows you to enchant snow golems for new abilities! (made for WinterJam)
Neutrality Redux
Neutrality Redux is a remake of a mod about the interaction, friendship and development of the Illager race!
Subota
Subota is a horror mod that brings terrifying desktop-level events, jumpscares, and loud sounds to your Minecraft world.
Leo's Medieval Fantasy
This is Leo's medieval fantasy , enjoy beautiful views , fight monsters dragons and countries while enjoying the medieval life.
Camel Extend
nhances camels with intelligent self-healing: they automatically seek & consume nearby cacti when injured while gaining complete immunity to cactus damage.
New Potions & Effects RE
This modification adds new effects to potions! For example, a detonation potion that explodes a player or creature at the end of the effect!
Grimoire Ascension
Step into a world filled with magic, grimoires, and powerful battles inspired by the universe of Black Clover.
Strike After Swing
Delays mob melee damage until the attack swing animation finishes.

Spectrum Compat
Integrates Spectrum mechanics into other mods
Frost Enchantments
This mod adds the Frost Aspect and Frost Protection enchantment. It uses the already existing freezing effect feature and turns it into a powerfull enchantments.
IFC-Integrations
Unite the worlds of Ice and Fire and MCA Reborn with legendary relics, enhanced creature interactions, and a new way to experience both mods together.
Age of Bismuth [More ores & Tools]
Add new ores, new tools and more !
Dino's dragons
This mod adds dragons to minecraft
The Summoner (Reforged)
Adds the mysterious Summoner mob and the ability to capture the spirits of mobs!