Colored Slimes

you need a color id from 0 to 15, for example 15 is black

neoforge 26.1.1:
/summon minecraft:slime ~ ~ ~ {"neoforge:attachments":{"coloredslimes:color":{color:15}}}

fabric 26.1.1
/summon minecraft:slime ~ ~ ~ {"fabric:attachments":{"coloredslimes:color":15}}

forge 26.1.1
/summon minecraft:slime ~ ~ ~ {Color:15}

replace_spawnrule=false

which is false by default so other users wont get the spawn feature by default.

Then spawn_on_surface_only=false (forge/neoforge only)

by default they dont spawn only at the surface but you can now force it.

After that 2 other number for the spawn condition which will make them spawn only when the sky light level is between the 2 number.

By default the number will be from 0 to 15 so they spawn all day.

(sky_brightness_level_min=0, sky_brightness_level_max=15)

Another option is weight=0

0 means it wont spawn, the more number you write here the more chance this monster will spawn instead of others, so more chance to spawn.

With this the replace_spawnrule is not even needed but i still added this two so you can leave the weight at the number you want and just disable the new spawn rule with replace_spawnrule when you dont want them anymore

After these they use the modified slime spawn rule

which gives us again more options like:

can_spawn_in_any_biome=false

which is false by default,

if its false it will use the biome tag allows_surface_slime_spawns

which is a vanilla minecraft json file which you can edit

And as you know slimes can spawn from the height of 50 --> 70

So we have now spawn_height_min=50 and spawn_height_max=255

The slime chunk thing is untouched.

You will have to delete your old config to use the new one if you had one or paste someone else configs data

I used these settings in my coloredslimesconfig.properties config file while testing to make it work:

random_color_when_spawning=true #boolean | default: true

weight=100 #int | default: 0

replace_spawnrule=true #boolean | default: false

spawn_on_surface_only=false #boolean | default: false

sky_brightness_level_min=0 #int | default: 0

sky_brightness_level_max=15 #int | default: 15

can_spawn_in_any_biome=true #boolean | default: false

spawn_height_min=50 #int | default: 50

spawn_height_max=255 #int | default: 255

check_area_size_for_mobs_of_same_type_when_spawning=0 #int | default: 0

max_mob_number_of_same_type_around_area_when_spawning=3 #int | default: 3

You might want to reduce the weight if there are too many out there as Monsters spawn at a fast rate.