General Tanankh

Tips
To efficiently solo farm the ring, you need Dimension Door and two or three different Hirelings.
 * Enter the quest The Chamber of Kourush.
 * Run to the Undead Area and check the Rare Encounters you want.
 * Use Dimension Door; this will bring you back to the entrance of The Chamber of Kourush.
 * Enter the quest The Chamber of Kourush.
 * Summon one of your Hirelings (all private instances you left will close upon joining any group).
 * Dismiss your hireling to start the cooldown timer.
 * Leave the quest The Chamber of Kourush for a new run through the Undead Area.
 * The next time you enter The Chamber of Kourush, summon another hireling (because he's on a different cooldown timer).