After a player has finished casting his spells, he is allowed to dispel any spells that remain in play (unless they were cast in that magic phase), using as dispel dice any power dice not used to cast spells. These dice can always be added together, regardless of which Wizard they belong to. Note that the player only needs to beat the casting value of the spell in question - he does not have to beat the original casting score. Spells originally cast with irresistible force can be dispelled as normal in subsequent turns if they remain in play.
Finally, his opponent is allowed to dispel any spells that remain in play unless they were cast in that magic phase) if he has any dispel dice left, as described above.
Magic Resistant units that are under the effects of a spell that remains in play from a previous turn may at this stage attempt to dispel it using the dice given by their resistance, with or without the addition of any dice from the player's other available dice.