The Ender Dragon is a powerful entity that rules over The End. It is able take on male, female and a dragon form.
When the First Ender Wizard arrived in Elementia, it is rumored that the ruler of his home dimension had thrown him due to his theft of the Ender Scroll. The Ender Dragon later used magic to summon the Wizard Dragon, and claimed him as his son. He also took the Ender Scroll.