Custom Mob Explosion and Threshold | latcord | Page 1

weak quail Oct 5, 2025, 1:16 PM

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So im currently trying to make a zombie that carries a bomb with himself, which behaves like a creeper, however, i want to enlarge how big the explosion is and what particle it can emite.
The other thing im trying to do is a threshold so that if the mob is at 50% hp, it will give certain buffs:

StartupEvents.registry("entity_type", event => {
    // Doom Zombie
    const doomZombie = event.create('doom_zombie', 'minecraft:creeper')
    doomZombie.mobCategory('monster')
    doomZombie.sized(0.6, 1.95)
    doomZombie.clientTrackingRange(32)
    doomZombie.defaultGoals(true)
    doomZombie.setRenderType('translucent')
    doomZombie.animationResource(() => 'kubejs:animations/entity/doom_zombie.animation.json')

    // idle / walk
    doomZombie.addAnimationController('movement', 1, event => {
        if (event.entity.animationProcedure && event.entity.animationProcedure !== 'empty') return false
        if (event.entity.isMoving()) {
            event.thenLoop('animation.doom_zombie.walk')
        } else {
            event.thenLoop('animation.doom_zombie.idle')
        }
        return true
    })

    // play procedure-driven animation
    doomZombie.addAnimationController('charge', 1, event => {
        if (event.entity.animationProcedure === 'animation.doom_zombie.attack') {
            event.thenLoop('animation.doom_zombie.attack')
            return true
        }
        return false
    })

    doomZombie.setAmbientSound('minecraft:entity.zombie.ambient')
    doomZombie.setDeathSound('minecraft:entity.zombie.death')
    doomZombie.setHurtSound(() => 'minecraft:entity.zombie.hurt')

    // Angry Zombie
    const angryZombie = event.create('angry_zombie', 'minecraft:zombie')
    angryZombie.mobCategory('monster')
    angryZombie.sized(0.6, 1.95)
    angryZombie.clientTrackingRange(32)
    angryZombie.defaultGoals(true)
    angryZombie.setRenderType('cutout')
    angryZombie.animationResource(() => 'kubejs:animations/entity/angry_zombie.animation.json')

    // idle / walk
    angryZombie.addAnimationController('movement', 1, event => {
        if (event.entity.animationProcedure && event.entity.animationProcedure !== 'empty') return false
        if (event.entity.isMoving()) {
            event.thenLoop('animation.angry_zombie.walk')
        } else {
            event.thenLoop('animation.angry_zombie.idle')
        }
        return true
    })

    // attack
    angryZombie.addAnimationController('attack', 1, event => {
        if (event.entity.swingTime > 0) {
            if (event.getController().getAnimationState() === 'STOPPED') {
                event.getController().forceAnimationReset()
                event.thenPlay('animation.angry_zombie.attack')
            }
        }
        return true
    })

    angryZombie.setAmbientSound('minecraft:entity.zombie.ambient')
    angryZombie.setDeathSound('minecraft:entity.zombie.death')
    angryZombie.setHurtSound(() => 'minecraft:entity.zombie.hurt')
})```

EntityJSEvents.modifyEntity(event => {
event.modify("kubejs:angry_zombie", builder => {
builder.tick(zombie => {
if (!zombie || zombie.level().isClientSide()) return

        const currentHealth = zombie.getHealth()
        const maxHealth = zombie.getMaxHealth()

        // If health drops below 50% of max
        if (currentHealth <= maxHealth * 0.5) {
            zombie.addEffect("minecraft:resistance", 200, 0)
            zombie.addEffect("minecraft:strength", 200, 0)
            zombie.addEffect("minecraft:speed", 200, 0)
        }
    })
})

})```

@modest vigil this is what i got right now, cant seem to get it to work

celest trailBOT Oct 5, 2025, 1:16 PM

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Once your ticket has been resolved, please close it with </ticket close:1054771505520717835> command!

weak quail Oct 5, 2025, 1:16 PM

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kinda wish we had something like EntityEvents.tick

weak quail Oct 5, 2025, 1:51 PM

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EntityEvents.hurt(event => {
    try {
        let mob = event.entity;
        if (mob.type !== 'kubejs:angry_zombie') return;

        let current = mob.health;
        let max = mob.getMaxHealth();

        // Enrage only once when health <= 50%
        if (current <= max * 0.5 && !mob.persistentData.enraged) {
            mob.persistentData.enraged = true;

            mob.potionEffects.add('minecraft:strength', 600, 1, false, true);
            mob.potionEffects.add('minecraft:resistance', 600, 1, false, true);
            mob.potionEffects.add('minecraft:speed', 600, 1, false, true);
        }
    } catch (e) {
        console.error(`Error applying buffs to angry zombie: ${e}`);
    }
});```

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this kinda works? but idk if there is a better way to do this

modest vigil Oct 5, 2025, 2:18 PM

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instead of the hurt event i suggest doing it inside the tick callback so it retains those effects if its lower than 50% hp, then yo ucan set up an else statement that clears the potion effects if for some reason it gets healed

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as for the blast radius this can be changed via its nbt tag js entity.nbt.putByte("ExplosionRadius", 10)

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i suggest putting this in the onAddedToWorld callback in your entity builder

weak quail Oct 5, 2025, 3:15 PM

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modest vigil instead of the hurt event i suggest doing it inside the tick callback so it reta...

thing is, i dont think there is an equivalent of EntityEvents.tick that i can use

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from what i know

weak quail Oct 5, 2025, 3:16 PM

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modest vigil i suggest putting this in the onAddedToWorld callback in your entity builder

sweet, ill be trying that

modest vigil Oct 5, 2025, 3:21 PM

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weak quail thing is, i dont think there is an equivalent of EntityEvents.tick that i can us...

you already have it though, modifyEntity tick or if you have a custom entity just use the .tick method from your entity builder

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doomZombie.tick(entity => {})```

weak quail Oct 5, 2025, 3:22 PM

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ohhhh

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well thats gonna be a pain to test because im gonna have to restart every time sadge

modest vigil Oct 5, 2025, 3:24 PM

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oh nah

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just use global functions

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sec

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with global functions you can do /kubejs reload startup_scripts to reload instead of having to restart the game every time.

weak quail Oct 5, 2025, 3:25 PM

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oh like that

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thats very convenient

chilly irisBOT Oct 5, 2025, 3:25 PM

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➤ Liopyu

[➤](#1393733134956232785 message)

modest vigil Oct 5, 2025, 3:26 PM

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yup, its pain and suffering otherwise lol

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i also suggest you wrap it with a try catch like so, so if it errors it doesnt crash the game and instead outputs the error message js global.somefunction = entity => { try { // your code }catch(e) { console.log(e) } }

weak quail Oct 5, 2025, 3:27 PM

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modest vigil i also suggest you wrap it with a try catch like so, so if it errors it doesnt c...

i have been doing that lately, its extremely helpful

modest vigil Oct 5, 2025, 3:27 PM

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nice

weak quail Oct 5, 2025, 3:27 PM

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ok, let me test

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EntityJSEvents.modifyEntity(event => {
    event.modify('kubejs:angry_zombie', builder => {
        builder.tick(zombie => {
            global.handleEnrage(zombie, 0.5);
        });
    });
});

global.handleEnrage = function (entity, threshold) {
    if (threshold === undefined) threshold = 0.5;

    const current = entity.health;
    const max = entity.getMaxHealth();

    if (current <= max * threshold) {
        if (!entity.persistentData.enraged) {
            entity.persistentData.enraged = true;
        }

        entity.potionEffects.add('minecraft:strength', 20, 1, false, true);
        entity.potionEffects.add('minecraft:resistance', 20, 1, false, true);
        entity.potionEffects.add('minecraft:speed', 20, 1, false, true);
    } else {
        if (entity.persistentData.enraged) {
            entity.persistentData.enraged = false;
            entity.potionEffects.remove('minecraft:strength');
            entity.potionEffects.remove('minecraft:resistance');
            entity.potionEffects.remove('minecraft:speed');
        }
    }
};```

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good enough?

modest vigil Oct 5, 2025, 3:33 PM

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do this instead js builder.tick(zombie => global.handleEnrage(zombie,0.5))
rhino does a weird thing when you call a global like that in {} when its the only thing

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also i would move that 0.5 parameter to the global event itself as modifying it after startup will not change it unless you restart the game

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other than that it looks good to me

weak quail Oct 5, 2025, 3:34 PM

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sure! will do

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ok, works like a charm

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now for the other zombie

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    const doom_zombie = event.create('doom_zombie', 'minecraft:creeper')
    doom_zombie.mobCategory('monster')
    doom_zombie.sized(0.6, 1.95)
    doom_zombie.clientTrackingRange(32)
    doom_zombie.defaultGoals(true)
    doom_zombie.setRenderType('translucent')
    doom_zombie.animationResource(() => 'kubejs:animations/entity/doom_zombie.animation.json')

    doom_zombie.addAnimationController('movement', 1, event => {
        if (event.entity.animationProcedure && event.entity.animationProcedure !== 'empty') return false
        if (event.entity.isMoving()) {
            event.thenLoop('animation.doom_zombie.walk')
        } else {
            event.thenLoop('animation.doom_zombie.idle')
        }
        return true
    })
    doom_zombie.addAnimationController('charge', 1, event => {
        if (event.entity.animationProcedure === 'animation.doom_zombie.attack') {
            event.thenLoop('animation.doom_zombie.attack')
            return true
        }
        return false
    })
    doom_zombie.setAmbientSound('minecraft:entity.zombie.ambient')
    doom_zombie.setDeathSound('minecraft:entity.zombie.death')
    doom_zombie.setHurtSound(() => 'minecraft:entity.zombie.hurt')

    doom_zombie.onAddedToWorld(ctx => {
        ctx.entity.nbt.putByte('ExplosionRadius', 10)
    })```

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something like this you mean?

modest vigil Oct 5, 2025, 3:42 PM

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does onaddedtoworld take a context? i thought it was just entity

weak quail Oct 5, 2025, 3:42 PM

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am not sure

modest vigil Oct 5, 2025, 3:43 PM

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yeah its just entity

weak quail Oct 5, 2025, 3:43 PM

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alright ill change that

modest vigil Oct 5, 2025, 3:43 PM

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theres a full example page on the wiki if you ever wanna see

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https://github.com/liopyu/EntityJS/wiki/Base-Entity-Registry

weak quail Oct 5, 2025, 3:43 PM

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thank you

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yes i will take a look

modest vigil Oct 5, 2025, 3:43 PM

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here you can cross check if needed though again probejs also has this if you hover over the method

#

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it also has other useful information and all of them have example implementations you can directly copy

weak quail Oct 5, 2025, 3:45 PM

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those are some REALLLY helpful examples im seeing

modest vigil Oct 5, 2025, 3:45 PM

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ye

weak quail Oct 5, 2025, 3:45 PM

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thank you for the goldmine king, fixing this real quick 🙏

modest vigil Oct 5, 2025, 3:45 PM

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np

weak quail Oct 5, 2025, 3:49 PM

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tried entity.nbt.putByte("ExplosionRadius", 10) cant seem to notice any difference compared to the regular creeper explosion

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mhhh

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@modest vigil maybe there is a different name for it?

modest vigil Oct 5, 2025, 4:00 PM

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any errors in startup

chilly irisBOT Oct 5, 2025, 4:01 PM

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Please send your KubeJS startup log. It can be found at /minecraft/logs/kubejs/startup.log.
If you are on 1.18 or 1.16 it will be called startup.txt.
Please send the file directly, without links or snippets.

weak quail Oct 5, 2025, 4:01 PM

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nope

modest vigil Oct 5, 2025, 4:03 PM

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hmm

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try js entity.nbt.ExplosionRadius = {ExplosionRadius: 10}

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if that doesnt work then js entity.nbt.ExplosionRadius = 10

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if that doesnt work then js entity.mergeNbt({ExplosionRadius: 10})

weak quail Oct 5, 2025, 4:08 PM

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ill test these 3

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entity.mergeNbt({ExplosionRadius: 10})
this one worked

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poggies

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thank you so much @modest vigil, this was really helpful MumeiPray2

#Custom Mob Explosion and Threshold