Ranger – “Emerald” [5th campaign, 2nd mission]

That's absolutely correct, dragons can be hired. After capturing all the "demonic" castles, it becomes possible to build a "dragon hatchery" in the elven one. :rolleyes:

I think that the goal is not to collect 20 dragons (for example, I only collected 19), but to visit all the obelisks.

Well, this is just... I'm in shock. "I think"! Thinking is good, of course, but you also need to look at the mission objectives. It clearly says there that you need to collect 20 dragons in one army. And below it indicates how many you have already collected (for example: 17 out of 20 collected).
By the way, my mission ended when there were 22 dragons in the army (in one stack!)... I didn't need to split them into 20 and 2. :confused: