The Maelstrom's Eye — Roger E. Moore

From an elven admiral at the Rock of Bral, Teldin Moore learns more about his cloak's past and its potential powers--but he doesn't count on being caught up in the hurricane of the second Unhuman War. Vengeful humanoids rampage through the Known Spheres, and they're on Teldin's trail even as he hunts for the ultimate spacefaring ship of all: the mighty Spelljammer!