The Heroes of Phlan trilogy

The Heroes of Phlan trilogy by James Ward, with Jane Cooper Hong and Anne K. Brown, follows the adventures of Shal Bal, Ren o' the Blade, Tarl Desanea, and their descendants among the mystical pools that plague the Moonsea region.

The Pools

 * 1) Pool of Radiance (November 1989)
 * 2) Pools of Darkness (February 1992)
 * 3) Pool of Twilight (November 1993)