The Alien Sea (Dragonlance: Champions, #2)

The great poison of the World Gash spreads through the oceans of Krynn, killing all in its path. Led by Apoletta of the Dargonesti and Utharne of the Dimernesti, the two great aquatic races of sea elves convene a Conclave to address the mysterious, urgent crisis.
When undead attack the Conclave, Apoletta and Utharne must unite both their species, brave the storms of the World Gash and confront the ghosts of their past. What they discover will forever change their oceanic world and the fate of their two peoples.