Jormangandr

Jormangandr would be a very cool thing to add it is a sea serpent from norse mythology and would be a very creepy thing to add but possibly a new boss they have a lot of abilties and are considered a dragon because of their dragon like body.Unlike the Ender dragon the jormangandr lives in the sea and can shoot electricity from their mouth and can camoflouge themselves in the sea and can swim fast which you may need to add speed swimming because its fast (if its not already a thing) and agile,and can poison people and its tears,blood,saliva,and bodily fluids are poisonous as well.however it would give you something to fear in the water...something to fear more than sharks =)