Valkus was originally designed to contain the Red Dragon.
I personally have not been to the 2nd level of WC but I'm dead sure there is a 3rd level which might or might not have the Black Dragon (I don't know the Korean translation). However that monster is like an event boss from what I have heard. There might also be a map connected to the wooden temple in the DWLF. But I doubt they will have all this in right at the start.