The Spellslinger's Guide to Wurld Domination (2003)

From the back of the book:

…Since you’re looking at this particular installment to the Best Game in adventure gaming, that means you’re interested in the most challenging character class of all, the magic-user. We know how you feel, and we know just what you’re thinking: in a game of hacking the cards be stacked against ye:

You’re two decades older than your fellow adventures;
You roll a mere d4 for hit points;
You can’t wear armor;
You lug around a heavy tome wherever you trek;

But you have big plans. Very big plans. Finally, help arriveth:

Whether you profess to be the greatest spellslinger, or need to gird yourself for battle with such a power-wielder, this is the book for you! What you hold in your hands is the codex that will guide your quest for ultimate power like a brilliant beacon amidst a coastal storm.

This tome will assist your rise above the petty rabble of thieves, quacks, and thugs otherwise known as everyone you’ve ever met. This thoroughly researched and finely detailed reference work includes everything you ever wanted to know about the masters of arcane craft…

First printing: July 2002
Second printing: May 2003 (includes “Spellslinger’s Guide Clarifications” [errata] on the inside of the back cover.)