/* Какой-нибудь рандомный uuid */
private static final UUID MOD_UUID = UUID.fromString("3548342c-1bcb-4d61-aae5-3cf4330f02a3");
void setExtraHealth(EntityPlayer player, float value) {
IAttributeInstance attr = player.getEntityAttribute(SharedMonsterAttributes.maxHealth);
AttributeModifier mod = attr.getModifier(MOD_UUID);
if (mod != null) {
attr.removeModifier(mod);
}
if (value != 0f) {
attr.applyModifier(new AttributeModifier(MOD_UUID, "My extra health", value, 0).setSaved(true));
}
}