[Nerull]

SPOILER
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Copied this from another thread, which was copying another thread, etc. This one comes back up from time to time, since this it the closest thing to a true thinking person's quest in the game, though I think the Creator Ruins (where you go back in time) have decent mental puzzles, too.

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[Spoilers ahead] - copied intact from Bioware NWN forums
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"It took me a while, and a bit of trial and error (if you'll excuse the pun) but I finally managed to win Rolgan's trial with everyone voting innocent, and without bribing any jurors.

Here's how I did it...

Before the trial.
Talk to all of the witnesses and jurors and be nice to everyone. Talk to Lodar and keep buying him drinks until he tells you about how racist Griff is, and how Griff spiked the drink.

During the trial.

Lodar:
1. Ask him how Griff felt towards Rolgan. A supplement question should pop up. Sort of an Insight one. If it doesn't then you might need to raise your stats so it does.
2. Ask if it was true that Griff spiked the drink.
3. Ask if he saw who started the fight.

Don't ask the other questions.

Zed:
1. Ask if he saw who started the fight.
2. Ask if it was true that Griff spiked the drink.

Don't ask the other questions.

Vanda:
1. Ask why she sent her husband to see Griff.

Don't ask the other questions.

Call Rolgan.

Rolgan:
1. Ask what happened that night

Don't ask the other questions.

Closing argument:
1.Say that we know Griff was a violent man.
2. Say that we know Griff spiked Rolgan's drink.

Don't say anything else.

You should have now won the trial with all the jurors voting innocent.

Hope this helps."

As an aside, you can only get Zed's info about his leg if you can heal him; healing kits or spells will work for sure, not sure if a potion will.

Enjoy!!!