REQUIRED FOR FORGE USERS : Sinytra Connector, Forgified Fabric API

Every few minutes, a horde of a random number of Zombies will appear and go to a random location, and if one of them sees you, the whole horde will come after you. They can even see through glass or fence and break it to get to you.

If one of the players goes into the nether, the horde will be stronger.

Feel free to tell me in the comment if you want some changes !

Horde composition configuration for v1.05 and up :

You can add modded mobs into the horde composition.

If you want your horde to have multiple entity types you can add them this way in the mebahel-zombie-hordemob_type_config.json file :
{
  "hordeCompositions": [
    {
      "mobTypes": [
        { "id": "minecraft:zombie", "weight": 30 },
        { "id": "minecraft:skeleton", "weight": 30 }
      ]
    }
  ]
}

If you want your horde to have multiple compositions you can add them this way in the mebahel-zombie-hordemob_type_config.json file, the composition will be seleced randomly each time a horde should spawn :
{
  "hordeCompositions": [
    {
      "mobTypes": [
        { "id": "minecraft:zombie", "weight": 30 },
        { "id": "minecraft:skeleton", "weight": 15 }
      ]
    },
    {
      "mobTypes": [
        { "id": "antiquebeasts:draugr", "weight": 30 },
        { "id": "antiquebeasts:draugr_archer", "weight": 20 },
        { "id": "antiquebeasts:draugr_wight", "weight": 10 }      ]
    }
  ]
}
 

Configuration options :

"**spawnInDayLight**": true (true or false, if false the zombie horde will not resist to day light and will only spawn at night time)

"**enableDifficultySystem**": true (true or false, if this is enabled when a player go to the nether the difficulty will go up and hordes will have more zombies in it)

"**hordeSpawning**": true (true or false, if this is set to false no more horde will spawn, it basicly deactivate the mod)

"**hordeSpawnDelay**": 20 (a number between 1 minute and 60 minutes to choose how often will a horde spawn in your world)

"**hordeSpawnChance**": 0.8 (a number between 0.0 and 1.0, 0.8 mean 80% spawn chance for the horde everytime the timer is up)

"**randomNumberHordeReinforcements**" : 0 (a number between 0 and 10, 10 mean that the horde will have between 0 and 10 more zombies every time it spawns)

"**hordeNumber**": 1 (a number between 1 and 5 which will determine how many hordes will spawn each time the timer is up)

"**hordeMemberBonusHealth**": 0 (a number between 0 and 40 that will determine how much bonus health the Zombies in a horde will have, 20 mean 10 hearts)

"**hordeMemberBreakGlass**" (v1.05 and up) : true (if it's true the members of the Horde will come to you and break the glass between you and them)

"**hordeMemberBreakFence**" (v1.06 and up) : true (if it's true the members of the Horde will come to you and break the fence or fence gate between you and them)

My other mod :

Mebahel's Antiquebeasts