[SOLVED] [1.12.2] Syncing player capabilities in LivingDeathEvent

I need to give the player Exp from my mod when they kill specific entities, however when the event fires, they don't get any exp. What am I doing wrong? The event is fired, everything works, but the EXP still doesn't get set to what it should be set to.

@SubscribeEvent
    public void onDeath(LivingDeathEvent event) {
    	Entity entity = event.getEntityLiving();
    	if (event.getSource().getTrueSource() instanceof EntityPlayer) {
    		Random rand = new Random();
    		EntityPlayer player = (EntityPlayer)event.getSource().getTrueSource();
    		if (entity instanceof EntityShinobi) {
    			EntityShinobi shinobi = (EntityShinobi)entity;
    			int i = rand.nextInt(17);
    			int r = rand.nextInt(1);
    			if (r == 0) {
    				player.getCapability(CapabilityMana.MANA_CAPABILITY, null).setExp(player.getCapability(CapabilityMana.MANA_CAPABILITY, null).getExp() + 150+i);
    				PacketHandler.INSTANCE.sendTo(new PacketExp(player), (EntityPlayerMP)player);
    				
    			}
    			else {
    				player.getCapability(CapabilityMana.MANA_CAPABILITY, null).setExp(player.getCapability(CapabilityMana.MANA_CAPABILITY, null).getExp() + 150-i);
    				PacketHandler.INSTANCE.sendTo(new PacketExp(player), (EntityPlayerMP)player);
    			}
    		}
    	}
    }

Edited March 12, 20196 yr by FlashHUN