|“You four have merely scratched the surface of your full potential.”|
|“The nest of Firstbourne. And in it, your freedom and my power. Come now. Our future awaits.”|
|— Iron Baron|
The nest is like a mountain but with spikes along the way. There is an entrance shaped like a dragon's head.
Sometime when the First Spinjitzu Master created this realm, he created the nest along with it. When Wu and the Iron Baron went to retrieve the armor, they went inside the nest, and only Wu made it out.