Gene Mutation
Gene Mutation changes how hostile mobs behave over time, so that the threat rises as nights pass in a world.
What it does
Mobs accumulate genetic mutations gradually, and the difficulty climbs as the mutations build up. The chance of a mutation on a given night is set by the Mutation Probability option, and it can be configured so that more than one mutation happens in a single night. The Mutation Rate multiplier controls how strong each mutation becomes, so higher settings push the degree of change up faster.
Players can work against the rise. Killing a mob can drop its genes, with a default probability of 1%. A telescope lets a player observe a gene and see how it has been transformed and studied, and a degenerating table with degenerated gene fragments can lower the mutation degree of certain genes. Commands allow a player to identify a gene, set or reset a mutation degree, and print the mutated genes, so the state of the world can be checked directly.
The mod runs on Fabric and is published for 26.1.2 and 26.2 under the MIT License. It is not open source. Clients and servers both need it, so the mod must be installed on the server and on every player's client. The latest Fabric file, 1.0.0-26.2, targets 26.2.
Key features
Gradual mob mutations
Mobs gain mutations over time, and the mutations accumulate until the mobs become more dangerous.
Configurable difficulty curve
Mutation probability, mutation rate and the number of mutations per night can all be adjusted to shape the difficulty.
Gene drops and study
Killing a mob can drop its gene, and a telescope shows a studied gene and the transformations it has undergone.
Gene fragments and degeneration
Degenerated gene fragments and a degenerating table reduce the mutation degree of certain genes.
Gene commands
Commands identify a gene, set or reset its mutation degree, and print the genes that have mutated.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Survival worlds with a rising threat
Players who want night-time danger to grow over the course of a world can use the mutation settings to set the pace.
Tuning a custom curve
Server owners can adjust probability, rate and the number of nightly mutations to find their own difficulty curve.
Who it’s for: Players who want mob threats to change over time, and server owners who want to adjust how fast the difficulty rises.
Questions
Does Gene Mutation need to be installed on the server?
Which Minecraft versions does Gene Mutation support?
How can a player lower a mutation's degree?
In the catalog
Gene Mutation is one of 19,031 Adventure mods on ModsFinder, and one of 10,052 Adventure mods for Fabric. 13,894 mods support Minecraft 26.2.
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What the author says
This is a dynamically increasing difficulty mod, where the genes of all mobs undergo mutations every night. These mutations will gradually accumulate and eventually become very frightening. Everything can be adjusted in the configuration, and you can find your own difficulty curve.
Official listing
- Modrinth page
- modrinth.com/mod/gene-mutation
- Owner
- sea-sky-coder
- Published
- 2026-07-28
- Updated on Modrinth
- 2026-07-28
- Facts verified
- 2026-10-15