"Titan Legions" was notable for introducing the Imperial "Emperor-class Imperator Titan" and the Ork "Mega-Gargants", all of which were immensely powerful and could constitute small armies in their own right. These 'Mega' class vehicles could only be used in large games and none of the other races had such an equivalent. They were gradually phased out in later editions, though the current 4th edition has optional rules for them. The Imperator and Mega-Gargant are considered collectors' items today (the only other time that Games Workshop released them was as a "reward" in return for getting a yearly subscription to "White Dwarf" in the November 1997 issue). Besides one Imperator and two Mega-Gargants, the boxed set also contained ten Imperial Knights (these "mini-Titans" are also collectors' items) and twelve Ork Battlewagons.