Long ago Kas served Vecna the Whispered One as his chief general.

Kas turned upon his master after being turned into a vampire and gifted the The Sword of Kas.

Like Vecna the Whispered One he too found himself trapped in Ravenloft becoming the Dreadlord of Tovag.

Little is known of his recent dealings except that a skeleton of one of his vampire minions was found by Strahd von Zarovich when crossing The Ashen Wastes and is now under Strahd’s command.

A logo containing the Symbol of Kas was found by the party when adventuring in Cavitius