Bellumbeck

Bellumbeck is the form of Bellum in armor on the back of Linebeck. Bellumbeck is the true final boss of The Legend of Zelda: Phantom Hourglass. When Linebeck attacks Bellum's tentacles with the Phantom Sword while Link and Tetra are imprisoned by Bellum's tentacles, the creature gathers darkness around him, and makes him take the form of a giant Phantom. Bellum then attaches to the Phantom Linebeck's back and begins the battle.

Battle
When you begin the battle, you run around, and Ciela gives you a Phantom Sphere to pause time. Use it, then hit Bellumbeck in the back where his weak spot is. Ciela complains about how the eye isn't open and goes on the top screen and gets captured by a tentacle. Then the real battle begins.

Strategy
The way to beat Bellumbeck is to attack, wait, then strike; don't run away! Okay, go in and strike him a bunch, then he'll beck pushed aside, attack him, and Ciela will give you a Phantom Sphere. Now, the next time you attack him, he'll jump to the side, you have to stay with it, though. Wait until the eye opens, or get more Phantom Spheres, it's up to you, but when the eye opens, draw the figure 8 and get ready to kill him. Near the end, the eye opens less, and you have to attack him for it to open, then draw the figure 8 very fast. I recommend you to have 2 purple potions.

Down Swipe
A strait down swing with the sword, damages 1 heart

Side Swipe
Usually starting with a jump to the side, a quick motion to the side damages 1 heart

Hurricane Spin
Not the great spin you should know and love, but this spin actually makes a hurricane that can damage you multiple times, lasts about 10 seconds, damages 1/2 heart per hit.