Unless you are sitting on several months of saved up food and gold, I find this unlikely.  Also, don't you need to win a lot of combats to get them?

I don't believe that you could do this without gems is less than 24 hours.

I believe here food doubles on the 3th game and doubles against on the 4th. But I guess my food will be 500k add the 2th if it use the same formule as the piramide.

I can confirm that it doubles then redoubles as Jens says.  Check the dungeon's talk page.  Lots of people are posting their levels and food costs.

the habitat counts against your max too and its not as good as a big darkness one either so it really sucks to piss away that many gems/food on something that sucky

you not only need to win lots of combats but lots of tournys as well so yes if hes claiming to have done this already he is lying 

Not to mention a silly amount of food and gold.

EDIT:  I have both dragons, but I did it the easy way.  I paid for gems.  I'm so ashamed.

i have completed the into the dark quest but still i can't get my reward on storage

it's a base which is on your map.

I moved my dungeon base unknown that it cant be moved back to its natural place now its stuck on my volcano island, does anyone know what to do?

This is a known bug.  Monitor this thread.  If we find an answer, we'll post it.

EDIT:  I have attempted to contact social point and I'm waiting for a response.  According to the official forum, this is a known bug and if you contact them, they will put the habitat back.

I have created a new thread to address this issue.