some areas should randomly have phantoms  jsut roaming.. 
and perhaps they dont like  ghasts  or  regular skeltons. 
and of course  people.. 

please make sure pathign of everthign works better
and fog under lava.. we need a potion to be able to swim in fire.. to see  to get our netherite armor 
perhaps  bat wings  and golden carrot and magma cream to combine into a special ball that you can brew into a potion ?  
and a way to make potions last longer..