While playing, press [Ctrl] + [Shift] + "~". This will bring up a small text icon
at the bottom left of the screen. Type any of the codes below (including spaces):

Code - Result
@ bythepowerofgrayskull - Full Heal
@ ihavethepower - Full Mana
@ yourbulletscannotharmme - The Wizard is Invincible
@ dontfearthereaper - Adds Souls
@ castratetheheathens - Wizard Can Collect Red Spirits
@ timeisonmyside - Resets the Spell Timers
@ aplethoraof [monster name] - Summon 4 Monsters of [monster name]
@ alliwantforxmasisa [monster name] - Summon 1 Monster of [monster name]
@ gimmegimmegimme [spell name] - Gives Spell [spell name]

@ ragebuilding to instantly advance to Level 9 and gain all spells and creatures associated with that level.


I just finished the entire collection of creatures and spells you can get in the game.
If you use such cheat as "Gimmegimmegimme" on one of the the spell names as well as on one of the creature names the spell og creature will be added to your spell book.

Persephone

Creatures Spells
Manahoar Speed up
Druid Wrath
Ranger Heal
Shrike Ethereal Form
Scarab Grasping Vines
Troll Rainbow
Gnome Rain of Frogs
Gremlin Healing Aura
Mutant Vinewall
Ent Charm
Dragon Meanstalks


James

Creatures Spells
Manahoar Speed up
Trogg Rock
Earthfling Heal
Gargoyle Skin of Stone
Basilisk Soul Mole
Taurock Erupt
Flummox Halo of Earth
Ikarus Wall of Spikes
Boulderdash Bombardment
Jabberrocky Bovine Intervention
Rhinok Bore


Stratos

Creatures Spells
Manahoar Speed up
Frostywolf Lightning
Sylph Heal
Brainiac Air Shield
Vortick Freeze
Squall Chain Lightning
Storm Giant Soul Wind
Seraph Frozen Ground
Flurry Fence
Yeti Clouskill
Sliverback Tornado


Pyro

Creatures Spells
Manahoar Speed up
Cog Fireball
Flame Minion Heal
Spitfire Fireform
Tickferno Rings of Fire
Firefist Dragonfire
Pyromaniac Explosion
Pyrodactyl Firewall
Bombard Rain of Fire
Warmonger Blind Rage
Phoenix Volcano


Charnel

Creatures Spells
Manahoar Speed up
Scythe Insect Swarm
Fallen Heal
Locust Protective Swarm
Necryl Slime
Blight Animate Dead
Netherfiend Demonic Rift
Deadeye Wailing Wall
Abomination Plague
Styx Intestinal Vaporization
Hellmouth Death