Which hero do you like?

For the effective use of Haven magic, high spell damage is not needed (which is the main effect of the Archmage class - increasing efficiency has the greatest impact on damage), but rather their low cost: teleport already allows movement across the entire map, and slow already lasts the entire battle.

Yes, but... After all, the Archmage will enhance the quite useful spell "Illusions". In battles against hordes of undead or barbarians, this is a pleasant bonus. In addition, it will also enhance other spells. Such as Chaos and its direct damage. Nature will also enhance summoning, and Life will enhance Holy Word.