I solo all maps in all lands with relatively little trouble. The only time I have to work hard is when mobs are throwing flesh elementals and liches at me that cannot be dispelled. I can take care of them by stoning mining for fencing, but the mining bonus keeps me just dealing with it. This is the build: 120 mysticisim, 120 focus, 115 magery, 100 cartography, 100 mining, 100 lockpicking. The build would be more effective if I did not have real skills totaling 655. I could jewel up and add some fencing or swords, but the added effort is not worth it. The tactic is to find the location, drop an RC just before the chest appears, back off and invis till the spawn is gone. Then lockpick till open, back off and telekinisis. Loot the chest, being ready to drop an RC if some spawn shows. This works real good. The key to hunting if the spawn casts liches or fleshies is to be quick on the invis.
I used to play with a provo bard. That was pretty effective. The downside was that it was much slower than the mystic build, and I had trouble incorporating mining.
Mining is crucial for me. I can run up to a map location and usually find the place to dig in under a minute. Without mining there were times I could spend 5 to 10 minutes digging away.