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How to add a Capability for Extra Health


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Hey there, as the title suggest, I'm trying to make a capability that when the player has it, there health is modified. I've already made a capability that adds a type of mana and also made an item that modifies the entity reach attribute but for some reason, I'm having trouble making a capability modifying player health. 

public class Spectator9Health {
    private int s9Health = Player.MAX_HEALTH;
    private final int MAX_S9HEALTH = 30;

    public int getS9Health() {
        return s9Health;
    public AttributeSupplier.Builder createAttributes() {
        return Player.createAttributes().add(Attributes.MAX_HEALTH,10);
    public void copyFrom(Spectator9Health source) {
        this.s9Health= source.s9Health;

    public void saveNBTData(CompoundTag nbt) {
        nbt.putInt("s9health", s9Health);

    public void loadNBTData(CompoundTag nbt) {
        s9Health = nbt.getInt("s9health");


and here is the provider for it although i'm pretty sure the main issue is with the Spectator9Health class.


public class Spectator9HealthProvider implements ICapabilityProvider, INBTSerializable<CompoundTag> {
    public static Capability<Spectator9Health> SPECTATOR9HEALTH = CapabilityManager.get(new CapabilityToken<Spectator9Health>() {});

    private Spectator9Health s9health = null;
    private final LazyOptional<Spectator9Health> optional = LazyOptional.of(this::createSpectator9Health);

    private Spectator9Health createSpectator9Health() {
        if (this.s9health == null) {
            this.s9health = new Spectator9Health();
        return this.s9health;

    public @NotNull <T> LazyOptional<T> getCapability(@NotNull Capability<T> cap, @Nullable Direction side) {
        if (cap == SPECTATOR9HEALTH) {
            return optional.cast();
        return LazyOptional.empty();

    public CompoundTag serializeNBT() {
        CompoundTag nbt = new CompoundTag();
        return nbt;

    public void deserializeNBT(CompoundTag nbt) {


I've also tried a different method of doing the Spectator9Health class


public class Spectator9Health {

private int s9Health = Player.MAX_HEALTH;

private final int MAX_S9HEALTH = 30;

public int getS9Health() {

return s9Health; }

private Multimap<Attribute, AttributeModifier> createAttributeMap() {

ImmutableMultimap.Builder<Attribute, AttributeModifier> attributeBuilder = ImmutableMultimap.builder();

 attributeBuilder.put(MAX_HEALTH, new AttributeModifier(BeyonderHealthChange, "Health Modifier", 20, AttributeModifier.Operation.ADDITION));

return attributeBuilder.build(); }



and this method calls upon BeyonderHealthChange which is in a HealthChangeEvent that is coded as


public class HealthChangeEvent

{ public static void checkPlayerBeyonder(PlayerInteractEvent event, Entity pEntity, Player pPlayer, InteractionHand pUsedHand) {

UUID uuidForHealthChange = BeyonderHealthChange;

AttributeInstance maxHP = pPlayer.getAttribute(MAX_HEALTH);

{ AttributeModifier beyonderHealthModifier = maxHP.getModifier(BeyonderHealthChange);

if (beyonderHealthModifier != null)

{ maxHP.removeModifier(beyonderHealthModifier.getId());

double bHealth = pPlayer.getAttributeValue(MAX_HEALTH);

maxHP.addTransientModifier(beyonderHealthModifier); } } } } 


So yeah neither of these methods work and if anyone knows if I'm missing something or knows of a mod that accomplishes something along the lines of adding a permanent health boost without the health boost potion effect, it would be appreciated






Edited by SwimmingTuna
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  • SwimmingTuna changed the title to How to add a Capability for Extra Health

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