Silk Harvest

A Fabric mod for Minecraft 1.21.1 that adds a balanced system where mobs can drop their existing vanilla spawn eggs when killed by a player using an item enchanted with Silk Touch.

Features

• No new assets - Only uses existing vanilla spawn eggs
• Tiered drop chances based on mob category
• Configurable via JSON config file
• Advancement gating for rare mobs
• Variant-correct eggs (horses, cats, tropical fish, etc.)
• Durability tax on Silk Touch items when eggs drop

Core Mechanic

When any mob dies:

1. Check if the killing blow was dealt by a player
2. Check if the player's main-hand item has Silk Touch
3. If both are true, roll a chance to drop that mob's vanilla spawn egg
4. If the mob has no vanilla spawn egg, do nothing

Drop Chances

Common Passive Mobs (70% default)

• Cow, Pig, Sheep, Chicken, Rabbit, Cod, Salmon, Tropical Fish
• Baby penalty: -20%
• Looting bonus: +10% per level

Neutral/Basic Hostile Mobs (30% default)

• Zombie, Skeleton, Spider, Enderman, Drowned, Stray, Husk, Wolf, Bee
• No drops from spawner-spawned mobs
• No drops from tamed mobs
• Looting bonus: +10% per level (optional)

Rare/Utility Mobs (10% default)

• Slime, Witch, Guardian, Blaze, Ghast, Endermite, Shulker
• Requires: Silk Touch + Looting II+
• Must be natural spawn (no summons)
• Shulkers: Only drop if directly hit by player

Bosses (0%)

• Ender Dragon, Wither
• Excluded due to balance

Additional Balancing

• Durability Tax: +10 durability damage to Silk Touch item when egg drops
• Advancement Gating:
  • Enderman eggs: Requires "Free the End"
  • Blaze eggs: Requires "Into Fire"
  • Guardian eggs: Requires "The Deep End"
• Spawner Protection: Mobs from spawners never drop eggs
• Variant-Correct Eggs: Eggs match mob's NBT variant

Configuration

Config file: config/silk-harvest.json

{
  "commonPassiveChance": 0.70,
  "neutralHostileChance": 0.30,
  "rareUtilityChance": 0.10,
  "bossChance": 0.0,
  "babyPenalty": -0.20,
  "lootingBonusPerLevel": 0.10,
  "extraDurabilityCost": 10,
  "naturalSpawnOnlyForRare": true,
  "noSpawnerDrops": true,
  "noTamedDrops": true,
  "advancementGating": true,
  "variantCorrectEggs": true
}

Installation

1. Install Fabric Loader for Minecraft 1.21.1
2. Download and install Fabric API
3. Place this mod's .jar file in your mods folder

Building from Source

./gradlew build

The built jar will be in build/libs/.

License

All Rights Reserved