The first issue we have here is that Dragaera is probably not natural - and possibly the whole planet was Terra-formed. Many technological solutions can be imagined for some of the problems that prevent Venus and Mars from being suitable. For some reason, I picture Dragaera as being pretty polar. It does have day and night, but diffused. That diffusion may have been part of the plan - especially if someone intended to duplicate Faerie. Or it could be coincidental. Or our Faerie might be based upon Dragaera. And we don't know anything about its sun. We don't know how much magnetic protection is needed - whether it has lots of solar wind - or much of anything about it.