Economic Spells
There's too few economic effects for magic. Most of the spells suggested here are purely combat focused, whereas I'd like to see some stuff that's more economic. Perhaps this could be integrated to some new magic based victory.
I couldn't agree more!
I love the spells Inspiration, and Courage. I think the level I stone spell that creates a wall is bad-ass. Let's see more spells that revolve around terrain changing, city upgrading (or city-degrading for offensive spells), and so on.
Mage Towers
Archmage could be put in towers, and they could be used to achieve some kind of victory where you ascend to a higher dimension. You could have tower improvements, and they might be required to do some kind of summoning ritual in a city. Maybe more tower's would result in more powerful rituals.
To refine the tower thought... (Which I love.)
Tower Types based on Mana Types
1.) There could be one type of tower for each mana. Each of these towers would have a minor city benefit when they are first built, and would cost around 50 production (or something equivalent in mana with the new magic system.)
Magical Units Added To Mana Towers
2.) When a relevant magical unit is in the city (adept, mage, archmage, or whatever makes the most sense with the new magic system in 9.0) that unit has the ability to join the tower. When hovering over the option to join the tower, it would say something like; "Increases X between 5% and 50%". The range would depend on the power/upgrades/affinity of the unit in question.
Tower Limitation
3.) Each city can have up to six towers. Each tower can only have one unit. The unit can be removed and replaced once. (I suggest it being able to be removed and replaced once so players don't get angry when there isn't a very good buff from that unit and destroy the building and rebuild it looking for a better result.)
National Wonders with Tower Combinations Required
4.) Various combination of six towers within a city could open the doors for national wonders that can only be built when you have certain requisite towers. Because mana types are limited, you would only be able to build one to four of these in your average game.
New Magical Victory Type
5.) Perhaps if you build every one of the different national wonders that are enabled through various combinations of Magic Towers within cities, then a world wonder is enabled that grants a magical victory. Since this would require all types of mana and many different cities creating particular combinations of towers, and then building a large number of national wonders, I think it would make a very satisfying victory.
Either way getting magic integrated into economy would be ideal.
Also perhaps effects like Ilian winter spread would be a maintainable spell.
I'd like to see a spell that has the appearance of Ilian's territory. That would be awesome. If it turned a bunch of terrian into ice for ten turns or so with a blizzard above it. That'd be super cool looking, and a nice 'ouch' to the enemy player or AI.
New divine summons will be needed too. Perhaps more concepts along the lines of the planar gate/mercurian gate could be used-> build a gate-> get stuff crossing over.
I like the idea of more buildings that create gates that allow for new civilizations or monsters or whatever to cross over.
I really like the Pact of Nilhorn and think a Pact with Dragons and Pact with Unicorns and Pact with Pegasus and so on is in order.