From the back of the book:
Make your spellcaster the hit of the party!
Within this massive tome you'll find the spells your spellcaster needs to banish boredom and dispel dullness from any adventure. Send your GM into fits with spells the likes of Become More Invisible, Delayed Atomic Blast Fireball and the ever-popular Summon Gamemaster!
The Tome of Levity will bring laughter to the table of your favorite fantasy (and sometimes sci-fi) campaign.