I am to find mekrath. resque haer´dalis and take this portal stone...
but i can´t open the door to where he is "i am in the sewers with to secret doors, north on the map"...
what do i doo?

North in the sewers? I think you mean where this group of fighters/mages were, and you had to defeat them. That's not the door you're supposed to go to. You need to go to the left, and there's supposed to be a secret door (detect with thief). Then you can go upstairs to find Merkrath & Haer'dalis. The other door:
SPOILER!!!!
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The other door leads to the Mind Flayer dungeon. You can't get there until you've beaten a certain enemy inside the Firkraags dungeon.

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In the foul darkness one figure will emerge to save the world from evil and despair.... Light flashes as his sword comes down, and thunder rolls through the sky when he points his sword up to heaven to signal his victory....People whisper his name as he walks by, evil tries to hide as they sense his presence nearby.... His name? Link......

Thanx

What's in the mind flayer dungeon besides the note you get and some fairly tough fights...the last room I fought had the note, was there something else to it?

That hammer of thunderbolts is really interesting. Show it to a certain dwarven smith.

JR

Damned i lost cousin Jan's techno gloves