Basalt Cocoons and Magmafly

I thought "Mojang should add a new boss for the Nether Update" and I thought of this. What if they made a new structure called the Basalt Cocoon. It is a Cocoon shaped structure that is made of Basalt, Blackstone, Gilded Blackstone. It has basalt drooping down just like the Basalt pillars in the Soul Sand Vally. The new structure will be above ground hanging on the roof, floating islands, or cliffs. There will be magma cube spawners hanging on the Cocoon by chains. If the Cocoon is hanging over lava, then it is almost impossible to get near it by strider. It will have 2-3 spawners hanging on it. The main point of the Cocoon is to contain a new boss. Once you break the Cocoon it will explode the new boss will escape Its prison. Maybe the boss could be like a Magmafly. The Magmafly will have bright magma wings and the body could look like basalt. The magma and basalt would be could because the Basalt Delta are volcanic ruins so it makes sense. The Magmafly would fly around shooting fire charges and swoop down like a phantom. It would also have the ability to control volcanic ashes so it would use it to blind you for a few seconds then strike. Once you kill the Magmafly it will drop 2 new items called Magma Eye and Magma Scale. These items could be used to make weapons or amour.