The Hand of Flame was an ancient Klingon military unit that existed during the Mythic Age when the tyrant Molor ruled the lands. They were a rebel group who opposed him and were led by three leaders; namely O'gat, Kollus and To'Kar. Each of these leaders were a master of a style of combat and they alone fought against 50 of Molor's warriors and were victorious in battle.

It is said that when Kahless the Unforgettable himself learnt of the rebel band's leaders prowness, he recruited them into his army. They would then teach Kahless's army on how to fight in their three different fighting styles. After Molor's defeat, they would found the Schools of Great Warriors with Kahless's blessing. (TNG game: Klingon Honor Guard)