Suggestion: Revising Bloom of Twilight
The biggest issue I have with this spell is that with such a large mana investment you have no idea if the area you're targeting actually has any actual potential resources for city placement/development.
I would LOVE some kind of visual indicator, even if it's just basic colors (Red, Yellow, Green) and not the actual tile yields so that if I'm going to cast the spell there's some actual ROI. Casting the spell, finding nothing, then reloading a save point to try fishing again is really unfun.