Tiamat the Sea dragon the 3 sea creatures

2000 years ago there were sea creatures that were big they lived in harmony until a sea creature named kalfñor Destroyed and flooded the whole city kalfñor is a giant sea serpent that controls every living species creating a total disaster.one day a boy named Kevin he went diving with his friends until he saw a ancient ruin of a city but he realized the book he read a week ago was true he was horrified after diving he told his friends but they didn't listen he was so mad so after a year it was the event of Christmas Eve he went to the same ocean where he went diving he saw a glowing purplish sea serpent he was so shocked and the serpent roared at him but it didn't eat him it just stared at him and ran away