You need to find 3 hidden easter eggs. And a special character will appear. And then go to xith and activate easy mode to trigger the ending if you found all 5 the secrets. That is all I am going to say.
i know that, i think you mentioned where th easter eggs are before, but i havent found any in the spooky level world 3 that you said, i think it has something to do with the clock but i dont know what