ive heard that dragons are different from nukes and im trying to get one now but what do dragons actually do, its not in any forums or the wiki. are they like a really powerful ship or are they just like nukes?

Dragons are not different from nukes they take the place of Nukes since fantasy is about medevil times.so dragons are like nukes .

there are some slight differences though:

size: dragons are way bigger
silos: missile silos show u whether a missile is armed there in close look. While dragon lair only show if a dragon is living there in middle range look (with OPs are diamond shaped).

the rest is the same: cost, damage and how to use.