West of Obad, there are two mobs high on a plateau, erodach and greater infernal. These mobs are near impossible to kill solo, but they drop excellent loot.
to solo:
requires: spell chanting magic
At the spawn there is a tower. Go into the tower and climb to the top. Wait for the infernal and erodach to get close to each other and cast buffs on the erodach and/or the greater infernal. they will automatically start fighting themselves... repeat until they are both dead, you will have to manually kill the last standing, but it should be close to death.
PS. you do not even need to buff em. Wait a bit and they will attack each other. No buff needed.