The inhabitants of the lost land never called it Mandala. The Shard Sages came up with that, peering into the past and finding a strange void where something wonderful should have been. Nor are the ruins at Qalidar the ruins of Mandala. They're shadows, shadows cast by light drawn inward, swirling in the Storm, raging around drifting islands of crumbling matter before plunging into the hole in space and time left by the great land that never was.
Qalidar is a dark city where shadows fall from across time and space. It is as close to a home as anyone has ever found for the perytons, and its paths through the Storm connect worlds that were never meant to meet.
Qalidar was designed specifically for the True20 system and, in addition to the setting, includes new creatures, new treasures, and new rules that could enhance any OGL-based campaign, including a surprisingly fun system for alchemy and rules for traversing the Storm.