You will get your reputation with The Defilers (Horde) or The League of Arathor (Alliance) WoW Classic PvP factions boosted to Exalted. As the result you will get access to unique rewards of these factions. They include powerful high-level epic shoulders of any armor type, cloaks, weapons, and other rewards. At exalted standing you will also get your access to the quest, giving a very prestigious PvP tabard.
ETA: 3-4 weeks.
• Pick the desired reputation level (Neutral, Friendly, Honored, Revered).
• Access to unique factional rewards, depending on the reputation standing.
• Some honor kills and battleground wins received during the carry.
• Account sharing.
• 60th level.