Main Frame

The Main Frame is the final boss in Iridion 3D.

First Form
When first fighting the Main Frame, it will shoot fire from some holes provided. It will also shoot bullets from 4 angles. After dealing damage to the first phase, it will be destroyed and the player will proceed to the second form.

Second Form
After destroying the first the first phase, it's time to fight the second form! The Main Frame will now shoot large fire beams from the middle that will rotate, but will not shoot bullets this time. Deal enough damage to proceed to the final form.

Third Form
Unlike the second form, the Main Frame will shoot out TWO fire beams that rotate around, making it harder for it to be defeated. It can counter-clockwise its fire beams at some point, making it even complicated to tell when it will rotate to the opposite side. After that, deal multiple damage until it is finally destroyed. You have now completed Iridion 3D!

Trivia

 * The Main Frame is the only boss with 3 forms/phases.
 * It is possible to defeat the Main Frame without the Blue Orbs. However, it will take a VERY long time just to destroy a phase, one by one.
 * Oddly enough, destroying any of the forms will still cause the fire sound effects to play.
 * The third phase of the Main Frames face bears a similarity with Tabuu, an enemy in Super Smash Bros. Brawl.