Your imps live their little mischievous lives in the pits of hell, blissfully unaware of the life of servitude that is about to befall them. A warlock has descended into the abyss, ready to enslave hordes of imps to bend to his will.
Sparing your imps this dreadful fate is no less challenging than herding cats. Flee across the four rivers of hell, dodging the pursuit of the ever persistent warlock. Channel the powers of hell itself to bend and twist the warlock's mind to control his actions. Of course, your imps also use their clever mischief to their advantage as they attempt to outrun all of the other imps in hell. After all; they don't need to be faster than the warlock.