When you dodge an attack, you gain Unfair Advantage, which strikes back and inflicts 100% of the main-hand weapon's damage. It cannot be activated more than once per second.
To obtain the Unfair Advantage Rune in World of Warcraft, follow these steps
1. Travel to Lost Rigger Cove in Tanaris: You can find Lost Rigger Cove located at coordinates (/way 71 45) in the Tanaris zone.
2. Defeat Southsea Pirates: While in Lost Rigger Cove, defeat Southsea Marauders and Southsea Freebooters until you acquire a Kidnapper's Purse.
3. Open the Kidnapper's Purse: Use the Kidnapper's Purse to obtain the Precious Medallion.
4. Travel to Steamwheedle Port: Head to Steamwheedle Port, which can be found at coordinates (/way 67 22) in Tanaris.
5. Exchange the Precious Medallion: Find Jabbey in Steamwheedle Port and exchange the Precious Medallion with him to obtain the Unfair Advantage Rune.