Stealth Ring Quest/Spoiler

This quest is not at all complicated, just dangerous.

Method

 * Head to the Minotaur Tower north-east of Darashia (here). You will only have to face Minotaurs on the ground level.
 * Go down the staircase. Down these steps you will face Minotaurs, Minotaur Archers, and one or two Minotaur Guards.
 * Head to the East/North-East. There will be another staircase to go down. On the next level are all kinds of Minotaurs, including Minotaur Mages.
 * On this level, head North. Look for another staircase down. Down this staircase, you will face one Mummy.
 * After killing the Mummy, the Stealth Ring can be found in the South-East coffin, in the corner.