Cetus

Cetus is the second Constellation that you'll experience after you've made your way through the tutorials. The Boss once you reach level 5 is The Sea Monster (as you can see to the right). He'll dive in and out of the water planet, so it's best to block his attacks and then do damage. Creat Rocket Bombs (Metal Gems + Power Gems) which makes a Rocket that does immense damage to him.