Spells are researched in the Citadel when you capture an enemy that has spells for you to learn. The research is accomplished through a play of the 8x8 grid using special rules, without an opponent.
You must have a Dungeon and a Mage Tower in your Citadel in order to research spells.
Research Spells: Match scrolls and gems to reach the target values displayed on the screen.
4-of-a-kind: Gives double points & generates 1 scroll.
5-of-a-kind: Gives triple points & generates 2 scrolls.
Heroic Effort: On a cascade of 5 or higher, the board is cleared of skulls, stars, & coins.
Special: If you complete a category, it clears the board of matching gems.
Defeat: You lose if there are no moves left.
Chill Touch (Easy)
Reduces all your enemy's mana reserves by 3. Adds +5 to your green mana.
Wake the Dead (Moderate)
Turns 1 Skull into a +5 skull for every 5 Green Mana. After gems are transformed, the turn ends.