But the funniest thing is, after studying the "summon ship" spell, no ship was summoned; the spell was inactive!!!!!!!

In reality, the "summon ship" spell is active. You just need to position Agrael on the shore, which is in the water. Basically, get as close as possible. Then the magic will work. You just need to pay closer attention; if you look carefully, you can see that you can stand in the water. And I finally completed the mission! There were 9 dragons, but with the help of the summon spell, I also went to another island, gathered an army, and thoroughly defeated those dragons! The main thing is to gather as much gold as possible; it's not worth collecting experience.