There are 31 spells in Arena.Xlsm. Spells are accessed through the spellbook. The spellbook is unlocked at level 10.
As you defeat enemies, you can collect their blood. Blood is needed to use spells and unlock new spells to use.
Magic Attack Spells
Magic attack spells will do significant damage directly to the enemy.
Passive spells are effects that accumulate every time the spell is used.
Self spells are spells cast on yourself for an effect.
Enemy spells are spells cast on the enemy for an effect.
Arena spells are spells cast on the terrain. All arena spells require a specific target cell to cast the spell on.