Unholy War
Secret Warriors and Mayhem Backgrounds:
Beat Strategy Mode on Normal level with each side. The Arcane victory will release the Menhir Circle, the Teknos, the Dark Maze.
To gain control of two secret super-warriors, beat Strategy Mode on Hard level. The Arcanes earn the nasty MegaPrana, while the Teknos recieve the Beta-Razorfane, their first truly effective flying character.
All of the above are usable in Mayhem Mode only.