Sea of Swords by R. A. Salvatore

Elf ranger Drizzt Do'Urden and his gifted warriors go in search of a missing member of their own band in this latest fast-moving fantasy adventure from bestseller Salvatore (Servant of the Shard, etc.). In the previous episode of the Paths of Darkness series (of the Forgotten Realms umbrella series), Wulfgar the barbarian fought a demon, was possessed and supposedly killed. Now it turns out that not only is he alive but he is in need of the type of assistance at which his friends excel. Getting to Wulfgar and aiding him in his quest for Aegis-fang, his warhammer, is only part of the fun.