This is from the second walkthrough at
http://www.aldorlea.org/officialsite/phpBB3/viewtopic.php?f=65&t=1636&hilit=metrolia+ruins (not the Pyramid one). As you can see, you really have to dodge some of the monsters to get anywhere, but if you can beat just one and go out a bunch, you can level up and that helps a whole bunch! just dodge the really bad guys!
Bits and pieces
62. Now to tie up a few loose ends. Explore Metrolia ruins. First go up the north passage. There are 3 types of monsters; the standard Unforgiving bones, the Mist wraith and the holocaust wraith. The Mist wraith are beatable if you are high enough level. The holocaust wraith has an extremely powerful physical attack and will kill you in one go. Try to avoid these. The only problem is they look the same until you run into them. But if you squint your eyes carefully you will be able to see the blue swirls on the Mist wraith. Go up straight and enter the first ruined house. The third jar has 61 gold. Try and leave the wraith in the top left corner alone he will definitely kill you. The Mist wraith in the top right is killable. There is nothing else in the bottom house so move on.
63. Enter the first house on the left. The jar in the top corner has a Magicka potion. The first wraith you see wondering around is a Mist wraith. Head right. The two top houses have nothing in them. Enter the bottom house. The wraith is a mist wraith. The chest down the bottom right of the house has an indinera potion. Nothing more in this house.
64. Exit and head further north. The broken pot next to the well will poison you so don’t touch it. Head up the left north path to get a knight helmet. Go back around and head up. There are three mist wraith floating around outside that you can kill and one inside a house is a holocaust wraith. Go right again. The second house has a chest. Open it to find a red pimento. Up north is a house on its own. The broken jar has 155 gold. There is a chest to the north that is unreachable, it’s a teaser chest. That’s it for this part of the ruins. Go back home and heal to prepare for the next section.
Hope this helps some. As the walkthrough shows, it's a good idea to wait until you do other quests so that you can level up (a lot!!) before you get to them. The luck ring will be very, very useful if you can get it.
Good luck!