Raiders of the Cliffs

Acquisition
This quest can be obtained during Act II. With Aveline in your party, you travel south past the location where the Qunari patrol is attacked by abominations.

Walkthrough
The quest involves destroying a well defended blood mage. When you fight him and his guards, watch out for the numerous traps (Standard -> Complex) and stay out of his deadly area damaging attacks.

Result
If you choose to charge in on your own, Aveline will rival you more (+5). If you choose to work with the guards and increase the morale of the men, she'll be more friendly towards you (+10).