The two sons murdered their father the King, and fight over who gets to be King. Each brother controls half of the nation. The dead capitol city is Yal and is now home to many evil creatures. The city, according to legend, was 10 miles across and made up of many tall and beautiful buildings. (Aligments: one brother is LE, the other is CE; the creatures in the city are various evil alignments.)
Tanoria is humans, elves, and half-elves.
Teslarc is good people, halflings, and gnomes.