There should be some old ones in the search feature but I can give you some tips.
Have HP/SP potions and be full on stones. Scrolls of Defense and HP would be very helpful as well. When you enter the room that goes dark, Explore it and KILL both mara pirates so they don't spawn on you when you fight your clone (I had this problem before I figured out that they spawned earlier than the final battle). Fight your clone but when the stone giants come, focus on those (there HP is rather low, so as a mage, killing them is quick). Keep a close eye on your health and you should do fine.
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Once a G____G, always a G____G
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