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Wow, I have a feeling that if I write now about how I got the Blade, it will cause a stir.
Well, okay:
I needed 7 heroes in total (although I bought one back twice), in addition to the starting hero and the hero in the dungeon. I bought Sylvia last, leveled her up on a golem with an oasis, then on the last of the four piles of gold, ran to the water, and got into the boat. The movement points were off the charts. I sailed to the nearest ship and escaped. I bought another hero in the Fortress - so many movement points! :) (that is, the navigation bonuses became land bonuses, I know it's not right, but the rules don't forbid it).
PS. Well, and again, purely IMHO. Wouldn't it be easier if they just allowed using these movement bonuses in the game? It would make verification easier and reduce the hassle of explaining the necessity of using this trick. But let's listen to what the organizers will say about clarifying the use of this bug-feature.