What habitat does a Black Knight Dragon need?

[FarmerTeach]

I have a Black Night Dragon that wants to leave the nest but says I need to buy a habitat. I can't find one for sale that has it's symbol. I have room in many different habitats, including Big Black Sands but obviously my Black Knight doesn't care.
What habitat do I need to buy? Thx in advance.

[xenu8]

Champion habitat

[FarmerTeach]

Thank you so much! No to wait for it to finish being made.