by the way, how did he defeat Jela with Crag? I've tried several times, but after 4-5 times the resistance triggers on my blindness spell, and I realize that I won't have enough mana.

Here! Now the real questions are starting, not "where does the ship come from?". If I remember correctly, the trick is as follows: first, attack Jela with several heroes to steal mana and destroy the war machines. When only the snipers remain, Crag attacks. The snipers have 32 shots, so we need to wait until they run out, using the resurrection spell 32 times. When the snipers become infantry, they slow down and are shot down. Simple and effective.

by the way, the "portal to the city" is available on the map as an event and is given before entering the Dragon Castle.

By the way, yes. I forgot about that.