Slime type files

One file per slime type, at data/<namespace>/productiveslimes/slime_type/<name>.json.

Example

The built-in Iron Slime:

{
  "color": "#D8D8D8",
  "food": "minecraft:raw_iron",
  "squeeze_result": {
    "id": "minecraft:iron_ingot",
    "count": 1
  },
  "production_time": 3600,
  "tier": 3,
  "breeding": {
    "parent_a": "productiveslimes:copper",
    "parent_b": "productiveslimes:stone",
    "catalyst": "minecraft:iron_block"
  }
}

Fields

Field	Type	Required	Meaning
color	"#RRGGBB"	yes	Tint for the slime, its slimeballs, jar and spawn egg.
food	item, list of items, or #tag	yes	What it eats to grow and breed, and what the Slime Pen's food slot accepts.
squeeze_result	item stack	yes	What one slimeball gives in the Slime Squeezer. count defaults to 1.
production_time	ticks	yes	Length of one Slime Pen batch with no food or upgrades. 20 ticks = 1 second. Wild slimes take twice as long.
tier	number	no	Used to sort types in JEI and the creative tab. Defaults to 0.
breeding	object	no	How to breed this type. Leave it out for types that only spawn or come from spawn eggs.
natural_spawn	boolean	no	true lets this type spawn in the Slimy Land. Defaults to false.

breeding

Field	Type	Required	Meaning
parent_a	slime type id	yes	One parent.
parent_b	slime type id	yes	The other parent. Order does not matter, and both can be the same type.
catalyst	block, list of blocks, or #tag	no	A block that must be within 2 blocks of the parents. Leave it out for no catalyst.
consume_catalyst	boolean	no	true destroys the catalyst block when the baby is born. Defaults to false.

When several types share the same parents, the one whose catalyst is nearby wins, then the one with no catalyst. See Breeding.

Adding a type

data/mypack/productiveslimes/slime_type/emerald.json:

{
  "color": "#41F384",
  "food": "minecraft:emerald",
  "squeeze_result": { "id": "minecraft:emerald", "count": 1 },
  "production_time": 7200,
  "tier": 5,
  "breeding": {
    "parent_a": "productiveslimes:gold",
    "parent_b": "productiveslimes:lapis",
    "catalyst": "minecraft:emerald_block"
  }
}

Then give it a name in a resource pack ("slime_type.mypack.emerald": "Emerald") and start a new world or reopen yours. It shows up in JEI, the creative tab and the breeding rules right away.