Egzen asked you to examine the Aetheric Field Protectors of the Drakans who appeared in the vicinity. The Aetheric Field Protectors turned out to be Undead Drakans. You discovered special Insignias on them. You showed the Insignias to Zigmuel. He said that they were Tiamat's Insignias, and assumed that Tiamat had once created these particular Undead Drakans.