Mabli, of line Galann was a force leader in the Klingon Marines. In 2233 he played a game of klin zha kinta against Thought Admiral Kethas, but secretly used a cybernetically-enhanced Lancer. When Vrenn defeated this Lancer, exposing Mabli's cheating, Mabli was killed by General Margon. (TOS - Worlds Apart novel: The Final Reflection)