What is "drakh"

The Drakh are a fictional alien race in the Babylon 5 universe. The Drakh were dark servants for the race of First Ones known as the Shadows. They appeared in the fourth and fifth seasons of Babylon 5, as well as the television movie, A Call to Arms. The Drakh are a ruthless, malevolent race who become prominent adversaries to the Interstellar Alliance following the conclusion of the Shadow War in 2261. Armed with the technology left behind by their Shadow masters, the Drakh are determined to assume their vacant role and, with the aid of other former Shadow allies, use it to establish dominion over the galaxy.

Mongoose Publishing's Babylon 5 Roleplaying Game has released a Drakh Sourcebook.