SPOILERS
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1) He in the large machine to the right before the bridge. their eight sides to it each containes a creature, i think he is in the second to last from the left. Oh and he is a gnome.
2)Summon a creature and place it before the stute, 5 demon knights appear. one of them has a part to Cryom Flayer.
3+4)The eye is part of a quest from the drow city.
If you kill them you find the hilt and can reforge them in to the vaporal blade two handed-sword.
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[This message has been edited by Gabriel (edited 03-14-2001).]