Ender Energy Manipulator

The Ender Energy Manipulator is an item from Draconic Evolution. It allows you to create Dragon Eggs while the Ender Dragon is alive.

Draconic Evolution Information Tablet text
Don't want to risk incurring the wrath of the Endermen by killing the Ender Dragon?

But you still want to get your hands on a dragon egg?

No problem!

This mystical device allows you to extract an egg from the Ender Dragon without killing her!

To get started, simply craft this item and right click the end portal with it (in the End).

The process will begin immediately.

Note: this may anger the Endermen just a little, but they will get over it. It's not like you're killing the dragon, after all.