Mobs of your own

expressiontype: <creature>since 1.7.28

What kind of creature it is: zombie, skeleton, iron golem. A zombie if left out

mob "Guard Dog":
    type: wolf
    health: 40

command /dog:
    players only: true
    trigger:
        spawn mob "Guard Dog" at player's location

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expressionname: <text>since 1.7.28

The name shown above it; the block's own name if left out, and name: none for no name

mob "elite":
    type: zombie
    name: "&c&lElite Zombie"
    health: 60

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expressionhealth: <n>since 1.7.28

Its health, in half hearts, up to 2048

mob "Tank":
    type: iron golem
    health: 400

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expressiondamage: <n>since 1.7.28

How hard it hits, for a creature that attacks

mob "Brute":
    type: zombie
    damage: 12

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expressionspeed: <n>since 1.7.28

How fast it is, as a multiple of what such a creature usually is: 1.5 is half as fast again

mob "Runner":
    type: zombie
    speed: 1.6
    baby: true

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expressionholding: <item>since 1.7.28

What it has in its hand

mob "Knight":
    type: zombie
    holding: diamond sword

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expressionwearing: <item>, <item>since 1.7.28

Its armour; each piece goes where it belongs

mob "Knight":
    type: zombie
    wearing: diamond helmet, diamond chestplate

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expressiondrops: <item>, <item>since 1.7.28

What it leaves when it dies, in place of what such a creature usually drops. drops: nothing for nothing

mob "Treasure Zombie":
    type: zombie
    drops: 5 diamond, 1 golden apple

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expressionexperience: <n>since 1.7.28

The experience it leaves

mob "Sage":
    type: villager
    experience: 200
    drops: nothing

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expressionglowing: true / silent: true / baby: truesince 1.7.28

As it says

mob "Marked One":
    type: zombie
    glowing: true
    silent: true

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eventon spawn:since 1.7.28

Runs when one is spawned. player is whoever's script spawned it, if anybody

mob "Herald":
    type: zombie
    on spawn:
        broadcast "&cA herald has appeared!"

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eventon death:since 1.7.28

Runs when one dies. player is who killed it; there is none if nobody did

mob "Bounty":
    type: zombie
    health: 80
    on death:
        if player is set:
            add 100 to {%player%.coins}
            send "&a+100 coins for the bounty."

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eventon hit:since 1.7.17

Runs when it hurts a player, who is player

enchantment lightning:
    on hit:
        if chance of 20%:
            strike lightning at victim

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What this event gives a script

Placeholder	Short form	Type	Meaning
`%event.attacker%`	`attacker`	text	Who dealt the damage: a player's name or a mob type such as zombie. For an arrow or other projectile this is whoever shot it. Unset for damage with no attacker, such as falling
`%event.victim%`	`victim`	text	Who was hurt: a player's name or a mob type
`%event.damage%`	`damage`	number	Damage actually taken, after armour and effects; 2 is one heart
`%event.cause%`	`cause`	text	Why: FALL, FIRE, ENTITY_ATTACK, PROJECTILE, DROWNING, VOID and so on
`%event.entity%`	`entity`	text	The victim's entity type, e.g. player or zombie
`%event.location%`		location	Where the victim is
`x of event's location`		number	The x of %event.location%, as a number
`y of event's location`		number	The y of %event.location%, as a number: how high it is
`z of event's location`		number	The z of %event.location%, as a number

Can be cancelled: Yes
player is: The victim if a player was hurt; otherwise the attacker if a player dealt the damage; otherwise nobody

More about on entity damage:, with a box to try it in

eventon hurt:since 1.7.17

Runs when a player hurts it; player is that player

enchantment dodge:
    on hurt:
        if chance of 10%:
            cancel event
            send "&7Dodged!"

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effectspawn mob <name> at <location>since 1.7.28

Make one of a described mob there. last summoned entity is the creature

command /boss:
    permission: op
    players only: true
    trigger:
        spawn mob "Frost Giant" at player's location
        set {_giant} to last summoned entity
        make {_giant} target player

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expressionmob name of <entity>since 1.7.28

Which mob block a creature was made from, as its name; unset for any other creature

command /summongiant:
    permission: op
    players only: true
    trigger:
        spawn mob "Frost Giant" at player's location
        set {_made} to last summoned entity
        send "&7That is a &f" + mob name of {_made}

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Guide and examples

A mob block describes a creature once: what it is, how strong, what it carries and drops, and what happens when it dies. spawn mob then makes one wherever you like.

mob "&bFrost Giant":
    type: zombie
    health: 100
    damage: 8
    holding: diamond axe
    wearing: diamond helmet, diamond chestplate
    drops: 3 diamond, 1 ice
    experience: 50
    on death:
        broadcast "&bThe Frost Giant has fallen to %player.name%!"
    on hit:
        apply slowness 2 to player for 3 seconds

command /giant:
    permission: "mobs.spawn"
    players only: true
    trigger:
        spawn mob "Frost Giant" at player's location

Inside the block	Meaning
`type: <creature>`	What kind of creature it is: `zombie`, `skeleton`, `iron golem`. A zombie if left out
`name: <text>`	The name shown above it; the block's own name if left out, and `name: none` for no name
`health: <n>`	Its health, in half hearts, up to 2048
`damage: <n>`	How hard it hits, for a creature that attacks
`speed: <n>`	How fast it is, as a multiple of what such a creature usually is: `1.5` is half as fast again
`holding: <item>`	What it has in its hand
`wearing: <item>, <item>`	Its armour; each piece goes where it belongs
`drops: <item>, <item>`	What it leaves when it dies, in place of what such a creature usually drops. `drops: nothing` for nothing
`experience: <n>`	The experience it leaves
`glowing: true` / `silent: true` / `baby: true`	As it says
`on spawn:`	Runs when one is spawned. `player` is whoever's script spawned it, if anybody
`on death:`	Runs when one dies. `player` is who killed it; there is none if nobody did
`on hit:`	Runs when it hurts a player, who is `player`
`on hurt:`	Runs when a player hurts it; `player` is that player

Syntax	Meaning
`spawn mob <name> at <location>`	Make one of a described mob there. `last summoned entity` is the creature
`mob name of <entity>`	Which `mob` block a creature was made from, as its name; unset for any other creature

Inside the four blocks {_mob} is the creature and {_name} its mob's name; in on hit: and on hurt: {_damage} is how much damage was done. cancel event in those two stops the damage.
A mob is known by its name without colours, whatever capitals it is written with: the block above is spawned as "Frost Giant" or "frost giant".
A creature remembers which mob it is. After a restart or a reload its blocks still run, as long as a script still has a mob block of that name.
The block's lines are worked out when one is spawned, so health: {boss.health} takes the saved variable as it is then. Local variables cannot be used in them.
For creatures with skills, phases and models of their own, the MythicMobs plugin and the HyperMobs addon go further.