I've done Grieg's lots of times with the little warrior. It *is* a great place for the level (though, at 50 it may be tough). Mob levels will range from about 52-53 at the entrances, to ~58ish deeper in.
Of course, you *will* need a decent to strong group at the recommended range, but it is quite possible.
One *HUGE* bonus about GE is that nothing on the main pathways will see invis. There are a couple see invis mobs in the side rooms (seems random, only sometimes I have run into them, and never on the main path from DSP to SD, DSP to Greig safe are, or DSP to SoL safe area).
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and got plauge which is a lvl 65 bst spell
Plague is also a level 49 shaman spell. This zone has a lot of casters, including shammies, necros, and wizzies.