Lord Damyn and Ayrn the Underlord were imposing menacing masses that ruled over their empire and caused chaos for crimefighters who, they faced on one occasion.
For Lord Damyn, supreme master of the outer space creature conglomerate known as the Citadel, his doom occurred when he allied with the evil Blackfire to recapture her sister Starfire. Now a member of the New Teen Titans, he allies from Earth-One helped turn the tide in battle which led the Blackfire betraying and slaying Damyn, assuming his rulership role.
For Underlord, supreme master of the subterranean civilization underneath Earth-Two, his downfall came after he allied himself with the Injustice Society. Although he captured members of the Justice Society who encroaches upon his kingdom to investigate, the Socialite Power Girl eventually overpowered Underlord.