<\/p>\n
## About
\nReactive World makes the Overworld’s fauna react to player hunting. When you kill animals, the world remembers.
\nThe more you hunt a species, the harder it becomes for that species to naturally spawn. Leave a mob type alone long enough, and the population gradually recovers.<\/p>\n
**More features will be added over time\u2026**<\/p>\n
## Installation<\/p>\n
* \u23e9 Requires **NeoForge** to be installed: https:\/\/neoforged.net\/.
\n* \u23e9 Copy the jar file of the mod in the “Mods” folder.
\n* \u23e9 For each version, check in the changelog the supported\/tested versions of Minecraft and Neoforge.<\/p>\n
## Affected Mobs<\/p>\n
The mod tracks kills and affects natural spawns for the following creatures:<\/p>\n
> Bee, Axolotl, Cat, Horse, Goat, Pig, Dolphin, Camel, Frog, Llama, Rabbit, Wolf, Sheep, Mule, Ocelot, Polar Bear, Panda, Parrot, Chicken, Squid, Glow Squid, Fox, Armadillo, Tadpole, Cow, Donkey, Cod, Salmon, Tropical Fish, Pufferfish<\/p>\n
Only kills made by players in the Overworld are counted.<\/p>\n
## How It Works<\/p>\n
**1. Kill Tracking**<\/p>\n
Every time a player kills one of the tracked mobs, the kill count for that species increases by 1. The game also records *when* the last kill happened.<\/p>\n
**2. Spawn Suppression**<\/p>\n
When a tracked mob tries to naturally spawn, the mod calculates the probability that the spawn is cancelled, using a sigmoid (S-curve) function:<\/p>\n
<\/p>\n
| Variable | Meaning | Default |
\n|—|—|———|
\n| `K` | Current kill count for that species | N\/A |
\n| `k\u2080` | Kill count at which there is a 50% chance a spawn is cancelled | `13` |
\n| `a` | Steepness of the curve (how fast the penalty ramps up) | `0.4` |<\/p>\n
– At low kill counts (well below `k\u2080`), spawns are almost unaffected.
\n– At exactly `K = k\u2080`, 50% of natural spawns are cancelled.
\n– At high kill counts (well above `k\u2080`), spawns are almost completely suppressed.<\/p>\n
**3. Fauna Regeneration**<\/p>\n
The kill count for each species slowly decreases over time, representing the population recovering. This happens on a periodic timer, but only if you haven’t killed any more of that species recently.<\/p>\n
The regeneration formula applied each interval is:<\/p>\n
<\/p>\n
| Variable | Meaning | Default |
\n|—|——————————————————————————|—|
\n| `r` | Regeneration rate \/ fraction reduced per interval | `0.02` (\u22122%) |
\n| Regen interval | How often regeneration is applied | `72000` ticks (3 MC days) |
\n| Idle threshold | Minimum time since last kill before regen triggers = `interval \u00d7 multiplier` | `1.5\u00d7` \u2192 4.5 MC days |<\/p>\n
So if you stop killing Sheep, after 4.5 in-game days the kill counter starts dropping by 2% every 3 days, gradually restoring natural spawn rates. Once the kill count drops below 1, it is fully reset to zero.<\/p>\n
## Configuration<\/p>\n
You can adjust these settings in the mod configuration screen from the Minecraft interface:<\/p>\n
| Key | Description | Default |
\n|—|—|—|
\n| `sigmoid_k0` | Kill threshold for 50% spawn suppression | `13` |
\n| `sigmoid_a` | Sigmoid steepness | `0.4` |
\n| `regen_interval_ticks` | Ticks between each regen step | `72000` |
\n| `regen_interval_multiplier` | Idle time multiplier before regen starts | `1.5` |
\n| `regen_rate` | % of kill count removed each regen step | `0.02` |<\/p>\n","protected":false},"excerpt":{"rendered":"
A Minecraft world that remembers you.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_minecraft_slug":"reactive-world","_minecraft_project_id":"CVLwBu4y","_minecraft_author":"Brezidan","_minecraft_license":"LicenseRef-All-Rights-Reserved","_minecraft_downloads":10,"_minecraft_follows":0,"_minecraft_client_side":"required","_minecraft_server_side":"required","_minecraft_storage_type":"zip","_minecraft_archive_name":"reactive-world.zip","_minecraft_size_bytes":39897,"_minecraft_version_count":1,"_minecraft_updated_at":"2026-05-16T13:12:18.465799Z","_minecraft_date_created":"2026-05-05T22:12:23.631378Z","_minecraft_date_modified":"2026-05-04T19:34:42.434084Z","_minecraft_project_url":"https:\/\/modrinth.com\/mod\/reactive-world","_minecraft_icon_attachment_id":0,"_minecraft_imported_at":"2026-06-07T15:11:08+00:00","_minecraft_import_hash":"31abffb95d0c290a95941c3d3ca3b12a","_minecraft_versions":"","_minecraft_links":"","_minecraft_gallery":"","_minecraft_api_metadata":""},"mod_category":[89,137,158],"mod_loader":[160],"minecraft_version":[163],"class_list":["post-129618","mod","type-mod","status-publish","hentry","mod_category-game-mechanics","mod_category-mobs","mod_category-neoforge","mod_loader-neoforge","minecraft_version-26-1-2"],"yoast_head":"\n