I have just left drow city and am going to meet whats his name at the
SE tunnels to do the first drow reqiuired quest.

When I leave drow city and cross the little narrow bride I run
into a mage or wizard that has about 12 guys helpping him fight me.

I have tried 10 times to kill them but no luck. Getting bored of
the situationa and just want to move on.

Me, Fallen Calvalier level 12
imoen lvl 11
minsc lvl 12
vionica lvl 12
krogan lvl 12
jan lvl 11

Any spoilers would be greatly appreciated. Not even intersted in
XP at this point just want to get out of my perdicament.

Jogie

If you wish to avoid them, simply cast Invisibility on everybody (or Stealth if applicable) and walk past them.

You're up against a band of adventures: there's a theif which keeps turning invisible and backstabing, some magic slingers, a bunch of summoned creatures, etc. They're tough (as you already know).

Do not fight them on their turf. I suggest you buff up on the north side of the bridge, summon some expendable cannon fodder, er, I mean trusted elemental assistants, send a tank forward and then run back in order to draw the enemy across the bridge and into the teeth of your troops. Finish them off piece meal.

You may want to have a detect invisibility spell ready to deal with that backstabbing thief. Additional option: disrupt the enemy more with an Entanglement, followed by a Cloudkill or series of Fireball spells. ;)

Web + Cloudkill is usually an excellent combination. Also, you could summon an Aerial servant...if you've got level six spells, and at the moment, I can't remember if you have level 6 priest spells at the 12th level or not. Anyways, you DO have true sight, which will keep that irritating thief from hiding and backstabbing you all of the time. Another method, if you absolutely can't get past things, would be to cast outileks resilient(sp?) sphere on one of your characters, and use them to block the bridge, while the rest of your characters attack with ranged weapons.