Elemental Forums
If you increase the Essence of a city, existing city spells use the old value. Furthermore there does not seem to be a way to cancel and recast them.
There's a list of current enchantments in the "Govern" area (Click on Govern in the lower-right corner). You can remove the enchantments on your city from there.
Does seem like you should be able to accomplish the same thing from the city details sheet.
/Signed, Except Enchanted hammers seem to be able to update... as the only one ^^
Was going to post this sometime, but then I forgot... (as usual xD).
Sincerely
~ Kongdej
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