The githyanki assault has come to a standstill, but to strike a final blow against their plans for conquest, the heroes must travel to the githyanki stronghold -- the city of Tu'narath on the Astral Sea. There, they must make contact with a faction of githyanki that is less-than enamored of their race's new allegiance to the Dark Lady. If the PCs are successful, they might strike not only a final blow for the freedom of their world, but make new and valuable allies in the process. "Tyranny of Souls" is an adventure for five 19th-level characters.

Tiamat casts a dark shadow across the ancient githyanki city of Tu'narath, but the city is no stranger to evil's machinations. Having endured the Lich-Queen's thousand-year reign, the city has witnesses astonishing wickedness. All was to have changed with Vlaakith's assassination, but the vacuum she created plunged the city into turmoil, with military commanders and pretenders all vying for her throne. When a leader emerged to right its course, though, it would lead the githyanki into greater darkness in Tiamat's thrall.