Midnight's Mask - The Erevis Cale Trilogy

The heroic Mask agent takes to the high seas for the good of the Forgotten Realms in this final Erevis Cale adventure
 
As shadows deepen in every corner of the realms, Erevis Cale rises further into the heights of his powers. But with such power comes a steep cost: the last of his humanity, which he feels slipping further and further away with each passing day.
 
But destiny waits for no shade, and Cale is forever in motion to discover his—from his clashes with pirates and a monstrous kraken on the Inner Sea to his ever-complicated rivalry-slash-friendship with Riven. In the end, being chosen by a god like Mask may be more curse than blessing . . .