Magic

Magic is the use of gems to dispense death to your enemies. Spells are specific to the battlefield and are used during combat; rituals, on the other hand, are bigger.

Not every hero class is as capable with a wand -- though they can all cast their own brand of magic. Mages, obviously, are the masters of this mechanic.

Gems

Gems are collected as loot after a battle. Every time you cast magic, you use up crystals. It is highly recommended that you save up your crystals for later in the game when you have to fight bigger, badder enemies.

Scrolls

Before every battle, you memorize a particular number of spell scrolls. You then have total access to those scrolls once you are fighting your enemies and your hero unit can use one scroll per turn until they run out. Each scroll can only be used once, however you can put as many of a single spell into your loadout as you have slots available.

Spell scrolls can be found on the bodies of dead enemies.

Loadout Slots

You have a limited number of slots to add scrolls to when you go into battle. However, as you level up, new slots may open up. There are also different tiers of slots. Higher tiered slots boost the damage or healing effects of your magic.

You can access your magic loadout and read new scrolls in the library screen.

Rituals

A hero is only required for a ritual if he is benefiting directly from the rite. Otherwise, you can simply cast it when ready. Rituals are grand magical doctrines that cause horrific damage or benevolent grace on a particular province or capital. Rituals effect your karma.