The Chaos Blade is book five in the Thirst for Power series, by Jason Halstead

In this epic conclusion to the Thirst for Power series, John discovers a new relic, powerful and terrifying. The discovery heralds a return to civilized lands for him and his companions. A sword, perfect in form and wicked in intent, possesses glows with a malignance all its own, and it seeks dominion over whoever wields and everyone around them.

Even with the help of his devoted followers John knows he can only resist the sword for so long. He must seek out the help of an old acquaintance, the wizard Kar, in the lands of Jennaca's birth to learn what, or who, it might be.

Learning the truth about the relic is just as double edged as the sword is. Between the power of John's Mistress and the power of the sword, only devastation awaits. Chaos breeds opportunity, but for whom?

For point of reference, the Thirst of Power series takes place several years after The Goblin Queen. It also involves some mature concepts, themes, and activities.

Keep an eye out for these other Thirst for Power books:

Book 1 - Enchanted

Book 2 - Warlock

Book 3 - Wizard

Book 4 - The Egg of Immorality

Book 5 - The Chaos Blade