Walkthroughs for custom maps.

And another point: what's the point of giving 3k ore for 1 knowledge point? There's no path to the promised helmet behind that tower.

But it's not that simple...
The thing is, you can cross the water by walking on it and get to the forest path below, and by following that path, you'll reach the hat that gives +6 to all stats.
But you don't have to rush to do that; you can approach it later...