Flying Dutchman

The Flying Dutchman is a boss in the Pirate Invasion. It has four cannons that drop cannonballs to attack and it will occasionally spawn standard enemies that you'd find in the Pirate Invasion. The Flying Dutchman does not disappear after the Pirate Invasion is over, and defeating the Flying Dutchman will not end the invasion. The Flying Dutchman can only be destroyed by breaking all four cannons.

Furthermore The Flying Dutchman can appear several times during a Pirate Invasion, even after being killed.