The Tralesta (also known as the House of Tralesta) was one of the historical clans of Acamar III.
After this massacre, unknown to the Lornak clan, five Tralestas were still alive. One of them, a woman named Yuta, underwent a biological alternation which slowed down her metabolic functions, thus allowing her to age at a much slower rate. Throughout the next century, Yuta exacted her revenge by tracking down and killing all but one of the Lornaks with a genetically engineered microvirus.
The Tralesta clan was exterminated when Commander Riker was forced to kill Yuta after she attempted to kill the last remaining Lornak, Chorgan, during negotiations between him and Sovereign Marouk. (TNG: "The Vengeance Factor")