Dupe On Hit
by hypercodec
Dupe On Hit makes a mob split into a copy of itself each time it lands a hit, on a Forge server, with a set of config options that control which mobs and targets are affected.
What it does
When a mob lands a hit, the mod has it perform mitosis, producing a duplicate of the entity that copies its NBT data directly. The mod is server-side only, so players join without installing anything and only the server runs it. Files exist for Forge only, across six game versions 1.20.1 – 1.20.6, with 0.1.0 for 1.20.6 as the latest file.
The config offers a fair amount of room to adjust behavior. A target whitelist can limit duping to the minecraft:player entity, so only strikes aimed at players set it off, while another setting decides whether skeletons, snow golems and comparable mobs may keep duplicating when they strike enemies that were themselves created by duping. Because most interactions can produce extreme entity counts, the author recommends pairing the mod with server entity optimization mods and entity rendering optimizations, and the default configuration is described as a playable survival setup. Since duping copies NBT data, it is generally compatible with most modded entities.
The mod is published under the MIT License and is open source, with public links for the source code and an issue tracker. It was first published and last updated on 2026-02-22.
Key features
Hit-triggered mitosis
A mob that lands a hit splits into a copy of itself, which copies the original's NBT data.
Target whitelist
The config can limit duping to hits on minecraft:player, so other targets do not trigger it.
Same-type duping control
A setting decides whether mobs like skeletons and snow golems may duplicate again when hitting their own duped enemies.
Adjustable config
Several options let server owners tune the mod, with a default configuration meant for survival play.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
OneHitKill is a Fabric mod for 1.20.1 under the MIT License, and it is not open source. Old Mob Hit Ranges is server-side only and open source under the MIT License, with files for 1.20.2 – 26.3 across Fabric, Forge, NeoForge and Quilt. Dragon Egg Dupe targets 1.19.2 on Forge, with the client and server environment and All rights reserved licensing.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Dupe On Hit | Forge | 1.20.1 – 1.20.6 | Server-side only | 2026-02-22 |
| OneHitKill | Fabric | 1.20.1 | Server-side only | 2026-01-01 |
| Old Mob Hit Ranges | Fabric, Forge, NeoForge and Quilt | 1.20.2 – 26.3 | Server-side only | 2026-08-23 |
| Dragon Egg Dupe | Forge | 1.19.2 | Client and server | 2024-09-27 |
Questions
Does Dupe On Hit need to be installed on the client?
Can the mod be limited to hits on players?
Does Dupe On Hit cause lag?
In the catalog
Dupe On Hit is one of 11,058 Mobs mods on ModsFinder, and one of 6,527 Mobs mods for Forge. 11,154 mods support Minecraft 1.20.6.
Similar mods
What the author says
This is a simple mod that makes entities duplicate whenever they hit something. There is a decent amount of config for you to play around with. I highly recommend that you pair this with server entity optimization mods, as well as entity rendering optimizations for cases with tons of entities.
Official listing
- Modrinth page
- modrinth.com/mod/dupe-on-hit
- Owner
- hypercodec
- Published
- 2026-02-22
- Updated on Modrinth
- 2026-02-22
- Facts verified
- 2026-10-15