Hordium
by SkyHant
Hordium adds raids that spawn configurable waves of mobs near players, and the raids are defined in JSON rather than Java code.
What it does
Raids in Hordium are built from datapack files. Each raid lists its waves, the spawn groups in each wave, and the conditions that start it, so a modpack author can write a new raid without rebuilding the mod. Trigger conditions cover dimension, biome, weather, moon phase and in-game day, and a raid can be started by those conditions or by a command. The bundled Undead Horde raid serves as a working example to copy from.
Entities are placed with full NBT data, including equipment, attributes, enchantments, passengers and custom data. Hordium uses standard vanilla entity NBT and AI, so mobs from other mods that support those standards can take part. Each raid shows a vanilla-style boss bar tracking wave progress and remaining attackers, and wave starts and checkpoints come with sound cues and glow effects.
Hordium is published for NeoForge 1.21.1 only, and it runs on client and server. Both the server and every player need it. The license is All rights reserved, so the mod is not open source.
Key features
Datapack-driven raids
Raids are written as JSON files, so no Java is needed to create or change one.
Weighted wave selection
Waves are picked at random by weight, and wave variants change the outcome from run to run.
Independent spawn groups
Each wave can hold several spawn groups that appear separately, each with its own entity data.
Trigger conditions
A raid can begin from its dimension, biome, weather, moon phase or in-game day, or through a command.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Custom invasions on a server
Server owners can add timed or weather-based attacks to their world by editing datapack files.
Modpack raid design
Modpack authors can define a set of raids for their pack without writing any Java code.
Who it’s for: Modpack authors and server owners who want scripted raids with mob waves, and players who want those attacks in a survival world.
How it compares
Infinite Raid is NeoForge-only for 1.21.4, with the same client and server environment, and is not open source. Custom Base Raid is open source under the MIT License for 1.21.1 on Fabric and NeoForge, and runs server-side with client-optional installation. Hordium is limited to NeoForge and 1.21.1 with all rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Hordium | NeoForge | 1.21.1 | Client and server | 2026-07-20 |
| Infinite Raid | NeoForge | 1.21.4 | Client and server | 2025-08-02 |
| Custom Base Raid | Fabric and NeoForge | 1.21.1 | Server required, client optional | 2026-09-13 |
Questions
Does Hordium need any Java to create raids?
Does Hordium have to be installed on both sides?
Which loader and version does Hordium support?
In the catalog
Hordium is one of 11,058 Mobs mods on ModsFinder, and one of 4,974 Mobs mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from SkyHant
Similar mods
What the author says
Fully datapack-driven raids of the undead (or anything else) — no Java required. Hordium adds a custom raid system where configurable waves of mobs appear near players, either randomly or through commands. Every raid is defined entirely in JSON, allowing modpack authors to create new raids without writing code or…
Official listing
- Modrinth page
- modrinth.com/mod/hordium
- Owner
- SkyHant
- Published
- 2026-07-15
- Updated on Modrinth
- 2026-07-20
- Facts verified
- 2026-10-15