The Servant of the Shard: The Sellswords, Book I (The Legend of Drizzt)

With each kill, I grow wiser, and with added wisdom, I grow stronger.

Powerful assassin Artemis Entreri tightens his grip on the streets of Calimport, driven by the power of his hidden drow supporters. But his sponsor Jarlaxle grows ever more ambitious, and Entreri struggles to remain cautious and in control. Soon, the power of the malevolent Crystal Shard grows greater than them both, threatening to draw them into a vast web of treachery from which there will be no escape.