Minecraft Forums

So you want to add a new mob to the game? Want to do it without mods? I have you covered! Make sure you're using 1.9 or 1.10 and please make sure you have cheats enabled =)

1. Give yourself a command block.
2. Summon in your custom mob using a website called MCStacker. Remember, we'll spawn it in naturally later! For now, spawn it in using the summon command.
3. Continue to step four if you want to add more abilities.
4. You can put a repeating command block on always active if you want constant effects, use the /execute command from the custom mob to do this. For example:

/execute @e[name=mob] ~ ~ ~ /effect @a[r=5] slowness 1 1 true








5. If you want more complex and timed abilities, add in a scoreboard objective.

/scoreboard objectives add timer dummy








6. Constantly add a score to the mob, and when it hits a certain amount, activate an ability and set the score back to zero.

/scoreboard players add @e[name=mob] timer 1

/execute @e[name=mob,score_timer_min=600] ~ ~ ~ /summon Spider

/scoreboard players set @e[name=mob,score_timer_min=600] timer 0

The code for this is at the bottom of the instructions! The instructions are simply there to explain what the machine does!

1. Give yourself a command block.
2. Add a counter objective.
3. Count the number of zombies (or any other mob of your choice) there are in the world.
4. When this score exceeds a certain number, activate a line of repeating conditional commands.
5. Tag a random zombie (or mob of your choice) with a name, and give all zombies a found tag.
6. Teleport the named zombie into the void and replace it with your custom mob using the /summon command.
7. You can even add a command at the bottom which tags zombies close to the player with the found tag, to stop custom mobs from spawning in your face!

#Legend:
INIT = Adding a scoreboard.
R = Repeating Command
COND = Condition Command
 
###
 
INIT: /scoreboard objectives add count dummy
 
 
 
R: /scoreboard players set counter count 0
 
/execute @e[type=Zombie,tag=!found] ~ ~ ~ /scoreboard players add counter count 1
 
/scoreboard players test counter count 5
 
R:COND: /entitydata @r[type=Zombie,tag=!found] {CustomName:"spawn_ghast",CustomNameVisible:1,Tags:[found]}
 
/execute @r[type=Zombie,tag=!found] ~ ~ ~ detect ~ ~-1 ~ sand -1 /entitydata @e[type=Zombie,c=1,r=0] {CustomName:"spawn_giant",CustomNameVisible:1,Tags:[found]}
 
/entitydata @e[tag=!found] {Tags:["found"]}
 
 
 
 
R: /execute @e[name=spawn_ghast] ~ ~ ~ /summon Ghast
/tp @e[name=spawn_ghast] ~ -512 ~
 
 
R:/execute @e[name=spawn_giant] ~ ~ ~ /summon Giant
/tp @e[name=spawn_giant] ~ -512 ~
 
 
 
 
R: /execute @a ~ ~ ~ /scoreboard players tag @e[type=Zombie,r=16] add found

The second chain command block says "tag !found found nothing" ...

It's working yeah. But the only problem (my long time problem) it can only use it naturally spawn "1" custom mobs. You cannot add more custom mobs that will naturally spawning too.

I'd like your new tutorial for more creatures EP1 but it's not working. Can you give me the Code?