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first of all you need a EntityDataAccessor for the size similar to the Slime define the EntityDataAccessor in #defineSynchedData via SynchedEntityData#define then create a method which sets the value of the EntityDataAccessor inside the method you also need to call #reapplyPosition and #refreshDimensions now to resize the Entity itself you need to override #getDimensions call super and scale the super value based on the EntityDataAccessor value this was the Entity part but you also need to change the Entity rendering inside your EntityRenderer you overwrite scale, im not 100% sure but i think you can simply scale the MatrixStack

why on earth are you create there a new Thread, the most vanilla code is not thread safe thats why your BlockEntity is null this will also throw an Exception since you mix up server and client stuff, the Minecraft class is client only so you can not use it there, if you want to debug your code (because it looks like it) you should use a Logger last but not least you should use the Java Naming Conventions (method names)

Also you are doing the same in

Here you are calling but you need to call the register method of

Oh thanks, didn't see it

take a look at the first post in this thread

show this method please

Also please show the class com.kolan.thoriummod.Event.CommonModEvents

show your Mod main class and the Entity registry

Hi! This means that Has a character inside it, that is not a-z 0-9 or /._-, in this case the big I in impostor. Registry names are always lowercase

this is your error

post full log

i suggest giving up and moving to 1.16/1.18.