The Korvalahrai were a race of demon seafarers who were invading the realm of the Kenryll'ah via the vast Chirahd river. When it seemed that they would overrun the Kenryll'ah, the latter considered forging an alliance with the Tiste Edur. In return for Rhulad Sengar diverting the river, which would destroy the Korvalahrai, the Edur would gain the services of more Kenyll'rah and possibly one or two minor Kenryll'ah.