Black 13

This shady group from Clan Eshin was responsible for Tilea's Night of One Thousand Terrors – a shock wave of assassinations. In a single evening, the Black 13 slew hundreds of generals, governors, nobles and other leading human authority figures, leaving the various republics ripe for the attack waves that began the following night. The Council of Thirteen themselves assigned the Black 13 their next target. The formation had secretly made its way to Lustria, where Lord Skrolk had given them their orders.

Source
[[Category:B]]
 * The End Times Vol IV: Thanquol
 * pg. 9