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What are you doing there at lvl12?? Its dangerous, you know...
One advice comes to my mind: summon lots of spiders. Have your Mirror Images on (Yan-Ti will cast a FoD or ADHW), use skull traps (do not fear to hurt the dwarf - it doesn't make difference).
The initial tactics would be to cast a skull trap into the crowd as soon as you portal in there. Go invis, and the battle will not start until you reveal yourself. Try to disrupt Yan-Ti's True Sight to keep your MI's on. Do try to get
the boots early and run in circles while waiting for a round to pass.
Archers use arrows of ice, they will damage you, but they have 5-6 of 'em each, so provide them with a target. Soon they will run out of arrows, and will be of no threat to you.
If you have the Robe Of Vecna, the chance of disruption of your spells will greatly decrease consider buying it beforehand.
That has to work...