A couple suggestions:
1) Once you have purchased all of the upgrades for a faction in a playthrough, you can purchase an upgrade (with gold, not FC), that increases the drop rate of that faction's FC. It gets kind of irritating to be sitting on many Qa gold and still only have 50 of a faction's FC.
2) The flat bonus granted by Blood Frenzy sort of bugs me, because even Call to Arms becomes more efficient than it very quickly. Maybe instead it could increase evil building production by, say, 500% + the number of evil buildings you own? Especially seeing as the Hall of Legends is unaffected by it, the spell is utterly useless compared to the good spell as the game progresses (the good spell falls off too, as is expected, but it takes MUCH longer).
I'd like it if the adventure reminder acted like the super-bat and the mini-garden, and you could go to the adventure page to check off an adventure and have the adventure reminder auto-complete that adventure. For town, 2 GC, for titled, 1002 GC, and for titled 10002 GC.