This quest is available from Keldon, who has been hired to get rid of the ogres in Alvar. He asks you to kill all the ogres in the Alvar Canyon area and then return to him. He is also willing to pay a bounty of 500 gold for each ogre ear returned (and will keep paying the bounty once the quest is complete, for ears collected outside of Alvar).
Monsters[]
Ogre brawler → Ogre warrior → Ogre warleader
Ogre mage apprentice → Ogre mage → Ogre magi
Soldier of Fortune → Mercenary → Mercenary captain
Walkthrough[]
Keldon can be found in the poorer section of Alvar, near the waterfall. The ogres are outside, between the main village and the small outpost on the road to Ravenshore, and inside the Ogre fortress. There is a cavern system beneath the fortress that also has some ogres in it; you will have to kill all of them to fulfill the quest. In practice, you must kill all the monsters inside the fortress whether or not they are actually ogres.
When you have finished killing them all (including the ogres outside), you should get a message You have killed all the ogres on the status line when you exit the fortress. If you don't get the message, check the fortress again, as it's easy to miss one or two, and it's large enough that you will get a green light at the exit even if one or two still remain in the back part of the caverns. Once you have gotten the message, return to Keldon and collect your reward.
A late version of Windows 7 could interfere with the message being displayed. Keldon will still pay up when the quest is complete, regardless.