DC's are short for demon crystals. It's the thursday daily and you need two CC'd archers for it.
The monday gold daily much like phalanx 2 makes Cloris ideal to level at some point since she is used in the H difficulty one.

And in all honesty, aim for the Desert Oasis mission it is the best. Many guides are outdated since they added the desert missions.

Well, the currently final desert mission at 40 cost is the best overall, but at lower levels it will be difficult so the 30 cost one (oasis) will be your best bet for fodders.