Dominions 3: The Awakening/Magic/The Schools of Magic

Cost per new level (total cost).

Alteration
Changes in the physical world. This School has many useful spells for Buffing but also interesting combat spells and rituals. The most famous spell in this school is Wish and lets you wish for anything (usually a Doom Horror).

Blood Magic
All spells that uses Blood Magic and blood slaves.

Conjuration
Summon powers and beings from other worlds. Very useful if your need Thugs, Fodder or Mages. Has also a few combat spells and buffs. Famous and feared is the ritual Ghost Raider that lets you call an undead army into any province like paratroopers. The ritual Wild Hunt summons an army to slain enemy priest.

Construction
Make magic items and constructs. Also allow some mass-buff combat spells and the Construction of a few Magic Monsters like the feared, flying and trampling Iron Dragon.

Enchantment
Grant magical properties to creatures, items or land.

Evocation
Projections of arcane power.

Thaumaturgy
Manipulate the arcana, minds and magical processes.