To cast a spell, you must make a 'Casting' roll. To make a Casting roll, roll 2D6. This represents the Wizard's attempts to draw raw magical power from the æther and shape it to their will.
The casting Wizard's Level is then added to the result of this roll to give a 'casting result'. For example, if a Level 2 Wizard makes a Casting roll of 1 and 6, the total casting result would be 9 (1 + 6 = 7 for the Casting roll, plus 2 for the Level of Wizardry).
Keep the dice in front of you for the moment – the scores will be needed if your opponent makes a dispel attempt.
Each spell has an associated 'casting value'. Spells with a higher casting value have greater effect, but require more power:
If the casting result equals or exceeds the spell's casting value, the spell is successfully cast (though your opponent may subsequently dispel it).
If the casting result is less than the casting value, the spell is not cast.