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Module TypeStand Alone
Created byBluePsychoRanger and Denniss
Compatible MC Versions1.16+

This module allows players to stop baby mobs from aging and allows certain mobs to age into other mobs.


The Everstone is a new item that can keep baby mobs as babies.


An Everstone can be obtained from mining stone during a full moon. The chance for an everstone to drop when mining stone is affected by Fortune.



0 0.25%
1 0.5%
2 0.75%
3 1%


Throwing an Everstone at a baby mob[1] or an Ageable Mob will prevent it from ever aging.

Mob Aging

When the module is installed, several mobs will start to age into other mobs, given specific conditions. The following mobs can age into other mobs. Mobs do not age instantly and it takes a while for each mob to convert into the other. The required times are based on the amount of loaded mobs that can age.

Mob Result Aging Condition Deaging Condition Minimum Time

(Ideal Conditions)

Guardian Elder Guardian At least 5 other guardians within 8 blocks Cannot deage 20 Minutes
Piglin Piglin Brute In a Bastion Remnant and less than 2 piglin brutes within 32 blocks Outside a Bastion Remnant 1 Hour
Skeleton Stray Under direct sunlight in a frozen biome[2] Not under direct sunlight or not in a frozen biome 30 Minutes
Slime Magma Cube In the Nether Out of the Nether 30 Minutes
Stray Skeleton In a non-frozen biome In a frozen biome 1 Hour
Vindicator Evoker At least 7 magic-containing blocks[3] within 2 blocks No bookshelves within 2 blocks 1 Hour
Zombie Husk Under direct sunlight in a dry biome[4], and not in water Not under direct sunlight or not in a dry biome 30 Minutes

Technical Details

Every 30 seconds, a random mob around each player will be selected to be aged or deaged. Similar to random tick speed, only mobs within 128 blocks of players will be checked. Mobs that don't age (including everstone-locked mobs) will not be considered in this random check.


Advancement Requirement
Evolution Halt
Use an everstone to prevent a mob from aging
Drop an Everstone onto an applicable mob


Version Date Change
1.16 04 Sept 2020 Installed a beta version on Public Server 6
25 Feb 2021 Released Everstone
1.17 23 Aug 2021 Goats and Axolotls are now affected by Everstones


  1. Does not apply to baby mobs who never grow up such as baby zombies
  2. Snowy Tundra, Snowy Mountains, Ice Spikes, Frozen River, Snowy Taiga, Snowy Taiga Hills, Snowy Taiga Mountains, Snowy Beach, Frozen Ocean, Deep Frozen Ocean
  3. Bookshelves, Enchanting Tables, Lecterns, Brewing Stands, Cauldrons
  4. Desert, Desert Hills, Desert Lakes, Badlands, Badlands Plateau, Modified Badlands Plateau, Wooded Badlands Plateau, Modified Wooded Badlands Plateau, Eroded Badlands