The Chess Set is a set of four Gears named after different Chess pieces. Some of the Gears reflect The Hellfire Club in the game. Some Hellfire Club enemies also use the exact same Gears in battle.

They are both labeled "The Chess Set - # of 4"

The Chess Set - 1 of 4: "The Pawn"

• Limited item (64 Gold); Available August 17-19/2012 in the Store
  
• Customized - Power is set by Agent level when acquired.
  
• Defensive Experiment - Increase Defense when attacked.
  
• Quick Action - Grants an immediate free turn after using
  
• Rook Ammo - Ammunition for The Rook.
  
• Shield (2 turns) - Absorbs incoming damage.
  

The Chess Set - 2 of 4: "The Rook"

• Task Reward weapon Task #20 Headmistress Frost
  
• Customized - Power is set by Agent level when acquired.
  
• Limited Ammo - Deals no damage when ammunition is depleted.
  
• Rapid Fire - Fires until ammunition is depleted.
  

The Chess Set - 3 of 4: "The Knight"

• Limited Item (64 Gold); Available August 11-13/2012 in the Store
  
• Customized - Power is set by Agent Level when acquired|Customized
• Protect - Protects allies from single-target attacks
• Counter-Attack - has a chance to perform a counter attack when attacked
• Radiation Exposure (4 turns) - Deals damage every turn; Increases damage taken from energy attacks

The Chess Set - 4 of 4: "The Bishop"

• Chance to get at Roulette after defeating Epic Boss Mystique.
  
• Customized - Power is set by Agent level when acquired.
  
• Counter-Attack - Has a chance to perform a counter attack when attacked.
  
• Rook Ammo - Ammunition for The Rook.