Hi, In 1.15.2 in our custom entity class you had a function called registerAttributes where you could set MAX_HEALTH, MOVEMENT_SPEED, ATTACK_DAMAGE, etc. Like this:     @Override     protected void registerAttributes()     {         super.registerAttributes();         this.getAttribute(SharedMonsterAttributes.MAX_HEALTH).setBaseValue(20.0D);         this.getAttribute(SharedMonsterAttributes.MOVEMENT_SPEED).setBaseValue(0.5D);         this.getAttributes().registerAttribute(S