Block Spawn

The attempts to spawn entities are in the order they are defined in the configuration file, meaning an entity that is second in order will only have a chance to be spawned if the one before it fails to.

{
  "minecraft:cobweb": [
    {
      "mob": "minecraft:cave_spider",
      "chance": 0.05,
      "adjustTerrain": false,
      "targetPlayer": true
    }
  ],
  "minecraft:stone_bricks": [
    {
      "mob": "minecraft:silverfish",
      "chance": 0.05,
      "adjustTerrain": false,
      "targetPlayer": false
    },
    {
      "mob": "minecraft:endermite",
      "chance": 0.01, // * 0.95 = 0.0095
      "adjustTerrain": false,
      "targetPlayer": false
    }
  ]
}

• list key The namespaced identifier of a block
• mob The identifier of an entity
• chance A percentage chance for an entity to spawn
• adjustTerrain Whether terrain around the entity should be destroyed when it spawns, keeping the block directly under it
• targetPlayer Whether the entity should spawn targeting and aggressive towards the player