I'm up to the elven lands in my current game, and when I complete the 'find a flower' quest, the elven dwelling offers unlimited druids. I don't think this was the case in my first game, but I could be wrong...
Power of Water is a one-off spell that works just around the corner from the place where you buy it. There is some debris floating in the water around to the left, and if you sail close to it, a popup window will ask you if you want to use the scroll. A ghost ship comes up from the depths, selling some stuff. Nothing exceptional in my game.
I am finding Druids quite useful now. They are a weak ranged unit but they can essentially hypnotize any animal and also spawn bears or ancient bears - that's pretty cool. Still, I doubt I'll seek them out after the elven lands.
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