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The Defiler
Gain exalted reputation with The Forsaken Defilers.
The Defiler is a 10-point achievement earned by reaching Exalted reputation with The Forsaken Defilers through Arathi Basin PvP matches.
Grind Arathi Basin Wins
Each Arathi Basin win yields approximately 80 reputation, and each loss yields roughly 40 reputation based on an average of ~800 resources gathered. Reaching Exalted from Neutral requires 42,000 total reputation, meaning you should expect around 525 wins or approximately 700 total games played assuming a 50% win rate.
Claim Your Tabard at Hammerfall
Once Exalted is reached, a quest becomes available in Hammerfall in Arathi Highlands. Completing the quest Take Five Bases rewards the 
Battle Tabard of the Defilers.
Pursue The Conqueror Next
The Defiler is a required step toward the meta-achievement The Conqueror, which also requires reaching Exalted with the Warsong Outriders, meaning a second full reputation grind of the same scale awaits.
Tips
Arathi Basin weekend bonus events increase reputation gains per match, so prioritizing games during these weekends reduces the total number of games needed.