i would say ice spirit is nice for mage.
the gizmo is realy cool when u have dragons couse its the only thing that can heal them. it also do very good damage on devils like 1000. it can give units extra attacks and stuff in end game. extremy usefull.
i played a mage to 30. now when i replay game on impossible i invest and use sprits alot more often. due to combats take much longer time couse all stacks u encounter is +70% bigger and magic have less effect.
the one i dont use much in end game was the fire one. the sword simply just do to little damage to be usefull. i think the swords from the ground aoe can be very usefull but only for warriors couse rage cost is like 40-60.
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