The most useful monster.

It's not always possible to reach them on the first turn, even with maximum Tactics. Still, I think the worst unit of level 4 is not Catapults, but Cavalry, but that's in terms of quality. In terms of efficiency for the army and overall development, Cavalry is definitely better! :D However, the benefits of magical units, Djinns, War Dragons, and Winged Lords, should not be underestimated. Sometimes they are more useful than a horde of Chaos Dragons, which is harder to obtain than to develop to the maximum in 8 castles!