If the alliance contains only Trusted or Suspicious Allies, power and dispel dice generated by the Winds of Magic can be split between the allied armies as the controlling players wish, but this must be done before any spellcasting is attempted. Dice generated by channelling must only be used by the channelling Wizard's army, as must any dice generated by magic items, special abilities and so on.

If the alliance contains one or more Desperate Allies, the power and dispel dice generated by the Winds of Magic must be split as equally as possible between the various allied armies as long as both of them contains at least one Wizard. If the dice cannot be split equally, roll off to allocate any spare dice. Dice generated by channelling must only be used by the channelling Wizard's army, as must any dice generated by magic items, special abilities and so on. Note that Wizards are not permitted to dispel an enemy spell that targets only desperate allies.