Defeat Ellia Ravenmane at Dome Balrissa.
Your "rival" has appeared again. Ellia Ravenmane has been avoiding her duties on the island, instead focusing on personal training, with the intent to defeat you in battle.
"I will destroy <name>," she said.
I have honored her request for a rematch, but I will be keeping a close eye on her. Her motives may be shifting in a dangerous direction.