When I was at school I was thinking about cool spell books, Enjoy!
Tome of the DarkCoil of the Dark (Death/dark coil)
Blood Drain (Life Drain)
Re-Animate the Dead (Death Knights ultimate)
Possess Soul (The spell that takes over a unit, sorry I forgot the name o.o)
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Tome of the AncientsCall Upon the Forest (Summons 2 Ancient Protectors 200 damage siege/50 fortified 10,000 HP)
Protectors Hail (Meteor strike or w/e with ancient protectors missile)
The Protectors Roar (Increase armor by 20 for 30 seconds, Base off Roar?)
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Furions Lost TomeEntangling Roots (Duh, entangleing roots)
Mana Drain (mana drain)
Earthquake (make it so the spell affects units too)
Call of the Wild (Stampede with the Deer, bear, and wolf models)
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Tome of the BerserkerBerserker (Berserker)
Bloodlust (Bloodlust)
War Cry (roar Increases attack by X. Note: if you can, make it lower your armor by like 10 or 20. Duration: 20 secs.)
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Tome of the WarriorStrength of the Warrior (Roar. 50 bonus damage, 15 bonus armor, and maybe 30% increased att speed)
Stun (maybe firebolt at 100 with no missile model?)
Valour of the King (Avatar Duration: 15 seconds)
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Tome of the MageFire Strike (Fire Strike)
Brilliance Aura (Brilliance Aura)
Fire Bolt (Fire bolt)
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Tome of the Anti-MageMana Drain (Mana drain)
Mana Burst (mana burst)
)To be continued
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More coming soon...