Grayson was the name used by a wood elf rogue with brown hair. He had one green eye and one black eye. For a time he fought the invaders from the Far Realm alongside the Brightstone Heroes; after they retook the city of Rathna, Balon Stonehelm recommended him to the Challengers of the Unspeakable.
In truth, however, Grayson was a disguised drow spy in the employ of Theriana. He accompanied the Challengers into the Pyramid of Shadows to rescue Gurrard and Priam, and - when it appeared they might be successful in escaping with their allies - turned on them. Though Gurrard threw a lightning-enchanted dagger straight into his heart, he managed to escape with a magical spell he'd previously prepared to save him from death. The spell couldn't get him out of the Pyramid, though, and Vyrellis tracked him down in short order. After learning all she could from him (including his true race and allegiance), she ended his life and delivered his belongings - and her information - to the Challengers of the Unspeakable.