Vorlem was a Cardassian gul.
In 2373, Enabran Tain, the former head of the Obsidian Order, lay dying. During a conversation about the necessity to have all his enemies dealt with, he asked his former operative Elim Garak whether he had been able to contact Gul Vorlem. Garak replied, "Years ago", subsequently confirming that all Tain's enemies were now dead. (DS9: "In Purgatory's Shadow")
This character was only mentioned in dialogue.