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The Fierce and the Furious
Collect any class armor set from PvP Season 6.
The Fierce and the Furious is a 10-point achievement earned by collecting any complete PvP Season 6 class armor set, available for purchase using 
Marks of Honor or gold in Northrend Dalaran.
Buy the Ensemble Directly
Purchase your class-specific Season 6 ensemble from Kylo Kelwin in the Northrend Dalaran sewers for 12 Marks of Honor. Using the ensemble immediately grants the achievement upon use, with no waiting required. For example, the 
Ensemble: Furious Gladiator's Ringmail Armor costs 
12 Marks of Honor.
Alternative: Buy With Gold
Five pieces of your Season 6 set can be purchased for gold from Arcanist Miluria (Alliance) or Magistrix Vesara (Horde), both located in Northrend Dalaran. The remaining pieces can then be purchased from Kylo Kelwin in the Northrend Dalaran sewers for a total of 4 Marks of Honor.
Tips
Buying individual pieces instead of the ensemble costs 17 Marks of Honor total versus 12 for the ensemble, making the ensemble the more cost-effective choice if you have no pieces yet.
Purchasing individual pieces rather than the ensemble does NOT automatically trigger the achievement — you must either wait for the 2-hour refund timer to expire or delete the items from your bags before the achievement registers.