Walkthroughs for custom maps.

Alexandr Z, here's the save file. It looks like the blue Polandroid hero is trying to summon a boat, and the game crashes.

The error in this case is adding the magic of movement; the game detects the presence of the magic and understands that the hero can reach the destination on the next turn, causing a crash.
It's better to add Angel Wings and remove them at the end of the turn.