You will need to collect 6 Dens from every region (Mystery, Amazon, Eastern, Polar, Western, Saharan), and each of these dens must be the exact same tier level
or the process to create a Fantasy Fennux will not work. The Fantasy Gateway is very picky, and will not care if you try to put in 36 dens that all have a certain
trait. It will disregard any attempts to use it like the Wishing Well, as this gateway is in a class of its own.
You will discover that the Fantasy Gateway is quite random when it dishes out sizes and eye colors. It's so random that sometimes it will spit out one of two new sets of eyes!
If you are fortunate enough to obtain both eye sets - breed them together and see if something special hides beneath them.
Want to learn more about the Fantasy Gateway? Click here.